Car Heater Blowing Cold Air When Idle

Ideal Air Conditioner temperature for electricity savings By Abhishek Jain (Mod) on August 7, 2017 with 739 Comments Buying an air conditioner once considered a sign of luxury, is now becoming quite common in India. what the op described its pretty much exactly what happend to me with my z. ? I have a 2001 GMC Yukon, the A/C will not blow cold air when car is stopped, only when in motion. If I am correct, the part is about $100. When the accelerator is pushed, the heat comes on with a vengance. Does not matter how long I let idle to warm up it still is blowing cold air into cabin until I drive the car. When you going down the road at 35 or more you get heat. To be clear: car is warm, system is blowing hot air (once up to temp), system set to 21 C, vent selection doesn't seem to matter, sometimes as far into our drive as 30+ minutes if we stop for as little as 30 to 45 seconds, the system will start blowing cold air. It only blows cold while running. I have a 2002 buick rendezvous it blows cold air when at idle and warm air when driveing. Once pressures equalize, the high pressure switch allows the compressor to start up again. Hey guys, 2003 3. Reader Question: My air conditioner is not cold enough at idle sitting at a stop sign, but gets colder when I get on the freeway. Blown or deteriorated head gaskets account for one of the most common and obvious causes of coolant bubbling. When your LS400 is cold, start it and run it for 5-7 minutes at 2500 RPM's adding coolant as necessary. not sure if thermostat was replaced, car never heats up or shows hot as if thermostat is sticking. When you were running a 190* in your convertible was it blowing hot? My car is a convertible and its heater doesn't blow hot at all. Changed stat,didn't help. Replaced my radiator. Car: 2000 Lincoln LS VS 96,000 miles. This isn't a huge problem really, especially since we only have 10 cold days a year in Tampa, but still annoying nonetheless. temperature gauge in good level. Open hood, driver side fire wall you will the see the heater core rubber hoses. If the heater hoses are clogged, the bypass is likely clogged too. only code i get is p0171. No heat till Im driving on the highway. Silverado & Fullsize Pick-ups - heater blows cold air at idle - i have a 08 silverado 5. No i kno the idrive thing with the fresh air. During boost, or WOT the car is running just fine with no signs of overheating. Muscle cars are more than a mode of transportation from point A to point B. Even sitting on idle it was giving out nice hot air! Doing this saved me £500 for a new heater matrix. I used my remote start to warm the car up. This bubbling is normal if you have air trapped in your system, and is caused by the air escaping as it reaches the area of the open radiator cap. I spent 15 minutes trying to get hot air this morning, and it never. This is a loss of coolant flow issue. You may have to register before you can post: click the register link above to proceed. If I give it a tiny bit of gas and bring the idle up a bit to 1200 rpm, the air becomes hot again. This is like a mini radiator, and the blower blows air over the matrix, and into the car. My Vehicle Heater is Blowing Cold Air in Winter Temperatures! December 12, 2013 With the frigid temperatures we have had in the past couple of weeks, many people are noticing that the heater in their car is not working at 100 percent. 3 v8 to go to work and my heat was working. You can get a simple fuse tester at any auto parts store, with a big assortment of fuses for around $10 but since ya have that fancy volt meter go ahead and check the air conditioner fuse. Im in the same boat as op, I thought I got all the water out, but I only have good heat when the car is driving, at idle I get cold air. A/C blows cold @idle, hot while driving The Vintage Air heater Control Valve on the FJ40 is. When the mercury begins to rise outside, it’s common for car engines to get overly toasty too. Even sitting on idle it was giving out nice hot air! Doing this saved me £500 for a new heater matrix. Once while discharging a passenger and again while waiting for a longer-than-average red light, the heater started blowing cold. Why heater in 2008 pontiac montana blows cold air when idling? It's fine when moving, have flushed system,put in new recirc pump,took out tee and nothing worked Follow. My 03 GX's A/C doesn't seem to cool all the time, it blows cold air (not very cold) and then warm (room temp) air on and off, while idling or driving, no matter how fast or slow. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. If I rev the car up to 2000 or so RPM, the heater will start blowing warm air again. Especially during hot humid summer days. However when coming to a traffic stop or other non-moving situation warm then hot air blows out the vents. I recently had the thermostat changed and the mechanic also did the bleeding to disperse any air locks/bubbles. yourmechanic. When the car is sitting still, it blows cold air but as long as you are traveling it blows warm. They're replacing the engine and that took a few weeks for the Buick dealer to get because there were. The radiator transfers the heat from the fluid inside to the air outside, thereby cooling the fluid, which in turn cools the engine. However when coming to a traffic stop or other non-moving situation warm then hot air blows out the vents. Blower motors and compressors are necessary parts, as well as relays, refrigerant, temperature sensors, and valves, switches, and gaskets. Car overheats and Air blows Hot at idle? If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions. When the car was moving, the heat would blow just fine. If a car is like your body, then the intake manifold is its lungs. Car Air-conditioning Compressor. 2 possibilities. If you stop at a red light or stop. I have a 2005 Ody LX with 39k miles that I just purchased used about a month ago. This bubbling is normal if you have air trapped in your system, and is caused by the air escaping as it reaches the area of the open radiator cap. Heat blows cold on drivers side and hot on passenger side? This problem is noticed on many car models. so it's heat time. But if your car heater starts blowing cold air and suddenly stops working in the middle of winter, it can make it downright miserable. Replaced thermostat and engine is at normal operating temp and still cold air until driven. Heat emanates off the core and this hot air blow into the car to heat the cabin. When I turn my heater on it blows cold air when the car is idle. I bought my 2003 land rover discovery a few months ago. Is the heater blowing cold air into the car, or is the car heater not blowing any air at all? How to Fix It If Your Car Heater Is Blowing Cold Air If cold air is coming out of the heating vents, even when the vehicle is warmed up and you've set the thermostat to hot, then you could be dealing with one of the following problems:. In some cases, they are installed in the bottom of the emulsion tubes, and require surgery to remove. Make sure both of your heater hoses are the same temp. what the op described its pretty much exactly what happend to me with my z. The 2001 Ford Taurus has 18 problems reported for heater blows cold air. I got in the car & the heater was on full blast, blowing COLD air. Here are a few things that you can check yourself that are likely the issue. F-350: My heater blows cold air at idle, then works engine revs - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. Previously it was very hot air. This is a loss of coolant flow issue. If your idle stays at 1500 all the time, most likely it is the electronic idle speed regulation. From a cold start, your vehicle’s thermostat will stay closed and you won’t notice any coolant flowing into your radiator. Does not matter how long I let idle to warm up it still is blowing cold air into cabin until I drive the car. com : Car complaints, car problems and defect information. When this feature is on, your car’s heat or AC reuses the air inside the car instead of continually pulling in air from outside. it's already down in the freakin 40's here. Upper rad hose is hot, lower rad hose is cold. In the summer the temp gauge is all over the place when at idel the temp will go higer but then goes down to normal when driveing. I immediately noticed problems with the wiper blades coming on, dash lights began to dim, radio light display unable to. Or worse yet, you come out to start the car one day, turn on the AC and it's blowing barely cold air when it was fine just yesterday. Here's some easy stuff for you to check. You should see some air bubbles escaping from the coolant tank. like it has a mind of its own. RE: Heater blowing cold air IP: Logged Message: Hi, I had heat in the morning, i went to turn the heat on to night, and it is blowing cold. I can't believe that level of incompetence doesn't land those scam artists in jail. When you going down the road at 35 or more you get heat. Car heater blowing warm, but not hot air? Chevrolet Silverado 2500 blows warn air on both drivers and passenger side. I get in after about 10 or 15 minutes and it is bone cold in the car. How to Tell If Your Thermostat Stopped Working When the thermostat gets stuck and stops working completely, there are several indicators you can check to determine the culprit. Is the heater blowing cold air into the car, or is the car heater not blowing any air at all? How to Fix It If Your Car Heater Is Blowing Cold Air If cold air is coming out of the heating vents, even when the vehicle is warmed up and you've set the thermostat to hot, then you could be dealing with one of the following problems:. Hope this helps. I have checked the coolant level and is normal. Car doesn't always over heat while idling. Is it normal behavior for Ody ? Can other posters to chime in to see if there's a trend. The fact it comes back on at idle shows it had a bad sensor or controller or bubble in coolant. I let it sit a good 10 minutes so that when I get in, it’s already nice and toasty. even when I turn the A/C off. From a cold start, your vehicle’s thermostat will stay closed and you won’t notice any coolant flowing into your radiator. The hot air is blown directly from the engine if the blend door isn’t working properly. Increase fan speed seems to help a little. 6L engine is open when the coolant is cold, raising the idle speed, and closes gradually as the coolant warms up to normal operating temperature. Normal A/C gets the same full hot air. Then, gradually, you began to notice that it wasn't really blowing cold air anymore, or that it would only blow cold when the car was moving but not at idle. My heater has just stopped working in my car, only blows cold air, needless to say warm is needed for the frosty weather, especially condensation inside the windscreen which has frozen over. I have a 2005 Toyota Tacoma 4. I own a 2010 Ford Taurus SHO and am having problems with the heater. amount of coolant through entire. A/C Blows Warm From one side - Cold on The Other. Another possible problem is the accumulation of dirt and debris inside of ductwork which can slow down airflow. When I put the car in drive and start moving, the cold air coming out of the vents starts to warm up. I have a 2002 buick rendezvous it blows cold air when at idle and warm air when driveing. Anybody got any ideas?. Driving around on a hot day in a car without a working air conditioner can be uncomfortable and even dangerous in extreme heat. Silverado & Fullsize Pick-ups - heater blows cold air at idle - i have a 08 silverado 5. It was working fine on Saturday morning but this morning to work it just wouldn't heat up - just blowing cold air. Heater blows cold air when stopped or ideling 5 Answers. Why is the air conditioning in my car not cold? I only seem to get some warm air blowing out of the air ducts inside the car? Added Freon and it's better. 6L engine is open when the coolant is cold, raising the idle speed, and closes gradually as the coolant warms up to normal operating temperature. When I stop at a stop light, it starts blowing cold air again. My car seems to blow out hot air into the cabin while I am moving forward, and seems to not do so when the engine is at idle. After several minutes (may take as much as 10 minutes), shut car off If you are getting heat out of the vents at idle, you have probably removed all air from system. Until suddenly over the last week the air has started getting cooler and cooler at idle until now where it is just blowing cold air again at idle only. If your system has a bleed port or bleed screw, and you can find it,. Sign In My daughter has a 2004 Mitsubishi Eclipse and when she starts the car on cold mornings the heater blows cold air and dosen't get warm until she is driving it and it gets about 2000 RPM's. heater blowing cold air. The temp stays normal in not cold or hot. Hi i have a nissan 2014 altima. Honest John Ask Honest John » Heater blows hot when moving and cold when still. The cables often fall off one end. Hope this helps. Of course, in weather like that, you probably had to use a block heater just to get it started. That, and low coolant level, would be the first things to check. Once pressures equalize, the high pressure switch allows the compressor to start up again. Question being: is this the compressor that has gone bad?. As soon as I start moving the car will blow hot air out of the heater, but as soon as I stop it would start blowing cold air. If your air conditioner is on, be sure to close your home's windows and outside doors. When your heater fails to come on in the winter and your air conditioning will not cool during the summer, you may think your heating and cooling systems are broken. I also have a 2012 fx4 screw and while it blows cold air the 04 will out perform it all day. If you stop at a red light or stop. 2002 VW Jetta 1. The cold air blowing at low RPM's is caused by air in the line that gets trapped at the high point, which is where the heater control valve is located. When driving heater work like it should. Especially if a car is a newer model, most people just assume everything’s OK, or that a light will show up on the dashb Low Coolant May Not Always Indicate a. You can get a simple fuse tester at any auto parts store, with a big assortment of fuses for around $10 but since ya have that fancy volt meter go ahead and check the air conditioner fuse. What Happens When the Timing Is Advanced It has long been held, and demonstrated at the Club's Dyno Days, that advancing the timing to 13 to 14 degrees before top dead centre (BTDC) is a cheap way of achieving lower rpm performance in the Mazda MX-5 1. However, when the car sat idle for a while (with the engine running and air-con on), the air stopped being cold and became a neutral temperature (I guess you could say it was slightly warm). The air conditioner operates much differently. It could also be that the new thermostat is bad and stuck open (that would be true if the car was taking a really long time to heat up). even when I turn the A/C off. Once pressures equalize, the high pressure switch allows the compressor to start up again. while my car is idling, the heater blows cold air, but when I am giving it gas it doesn't. The Causes Why Car AC not Blowing Cold Air When Idle? 1. Then again, I only do that in the summer. The [heater core]((https://www. Posted: Fri Dec 18, 2009 8:46 am Post subject: Cold Air Blowing Out of Vents When Idling When I am in my car and the engine is heated up the heat comes out great when I'm driving and moving along. Blowing the lid off air dryer maintenance (FYI from MCI-Sep 2008) Care and feeding of the Haldex air dryer (FYI from MCI-May 2008) Get prepared before the snow flies (FYI from MCI-Nov 2006) Blowing the lid off air dryer maintenance (FYI from MCI-Sep 2006) ABS Failures: Air Gauges - E4500: Air System Configuration - MCI D Series coaches with DDC. after driving for 5-10 minutes heater will warm up but when i pull up to traffic light it begins to blow cool air again. My Vehicle Heater is Blowing Cold Air in Winter Temperatures! December 12, 2013 With the frigid temperatures we have had in the past couple of weeks, many people are noticing that the heater in their car is not working at 100 percent. Also my car does not idle good seems to sputter at slow speeds. ? As soon as I get moving or rev the engine, it immediately goes back to blowing hot air. • 95 Chevy Tahoe, Heater Blowing Cold Air • 95 Chevy S-10, Wont Run • 95 Chevy Pick-up, Rear End Whine • 95 Chevy Lumina, Missed a Turn • 95 Chevy Lumina, Coolant Temperature • 95 Chevy K1500, High Speed Only Blower Fan • 95 Chevy Impala, Plugged PCV System • 95 Chevy Impala, Cold Exhaust Leaks. Coolant level is good. Even worse, “Air Injection systems,” which are standard fare for California cars, only run for the first 20-90 seconds immediately after a cold start with a cold ambient air temperature. So red lights suck. During boost, or WOT the car is running just fine with no signs of overheating. The little bit of car knowledge I have, I assume I have an airbubble in the heater core. while my car is idling, the heater blows cold air, but when I am giving it gas it doesn't. The car went from cold to overheating in two blocks. Exhaust gas—largely nitrogen, carbon dioxide, and water vapor—has a higher specific heat than air, so it still serves to lower peak combustion temperatures. Schedule an appointment online or stop by your nearest location today!. As soon as I start moving the car will blow hot air out of the heater, but as soon as I stop it would start blowing cold air. If you’re not feeling much airflow at all, the most common cause is an accumulation of dust in the vents, fans, and cooling channels. By Deanna Sclar. At idle it is warm but if you turn up the fan speed it starts to blow cold/cooler air. Chevrolet Impala Car Repair Questions. When your LS400 is cold, start it and run it for 5-7 minutes at 2500 RPM's adding coolant as necessary. CarComplaints. Why Would Fordf350 Truck Air Conditioning Blow Warm/hot Air Intermittently When the airconditioner is on sometimes it works just fine blowing cold air but more times than not, it will go to blowing warm to hot air through. An overcharged car AC system can start out pumping cold air. A defective condenser fan. Blowing the lid off air dryer maintenance (FYI from MCI-Sep 2008) Care and feeding of the Haldex air dryer (FYI from MCI-May 2008) Get prepared before the snow flies (FYI from MCI-Nov 2006) Blowing the lid off air dryer maintenance (FYI from MCI-Sep 2006) ABS Failures: Air Gauges - E4500: Air System Configuration - MCI D Series coaches with DDC. Sometimes when I am below 25 MPH it will suddenly begin to work- I. Car overheats and Air blows Hot at idle? If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions. When the car is first started and warms up, the heat should begin to blow warm air. when the car is accelerating it blows warm air but as soon as u come to a stop and idle say st a light it blows cold air ,even if u free rev it ,it stays cold Any help please!. Just initial cold start the heater will not blow hot air. Driving around on a hot day in a car without a working air conditioner can be uncomfortable and even dangerous in extreme heat. Radiators are also often used to cool automatic transmission fluids , air conditioner refrigerant , intake air , and sometimes to cool motor oil or power steering fluid. Low-level of Freon. i will start my car, head off to work, as i get some blocks away the car will warm up , i will tun my heater fans to max and i will get heat from my vents. Doesn't matter how long I am. Whether you need a brake component package for a classic car you’re restoring or want to make some money on intake systems you have for sale, eBay will satisfy all your auto parts needs. Another common problem is when air gets into the cooling system. Troubleshooting Car Air Conditioning Problems. any suggestions?. At idle, you should now begin to feel heat. Car: 2000 Lincoln LS VS 96,000 miles. i know you can turn the heater on and it keeps the car cooled down but sometimes the heat doesnt even work. Hi i have a nissan 2014 altima. A/C not very coldIt's 100 degree outside! OEM Issues. So I took that radiator fan and put it on the car, and just hooked up a very simple on/off switch to the fan and put that switch on my dash. They replaced Water pump, 2 thermostats, trying to burp the air pocket out, even raised front of car. The fact it comes back on at idle shows it had a bad sensor or controller or bubble in coolant. All of my controls do everything theyre supposed to on my climate control unit and a/c still works perfectly, the only thing that does nothing anymore is the hot/cold knob in the middle. Most of the reasons that a car heater will blow cold have to do with the heater core, but you can also have a mechanical, electrical or vacuum problem. thought I might have an air bubble, but after purging the system I still hae the same problem. And that truck has 180000 miles on it. If its low,then get it refilled to required level. When i turn the heater or the AC on, the high idle sound goes away. Cold air intake and how it works A cold air intake is used to bring cooler air into a car's engine, to increase engine power and efficiency. At idle it should drip. How-to: Correct and More Problems if Heater Blows Cold at Idle or No Heat - Second Generation Nissan Xterra Forums (2005+) I also recall squeezing the lower radiator hose with the radiator cap off to help burp the air as well as parking on a hill. Even worse, “Air Injection systems,” which are standard fare for California cars, only run for the first 20-90 seconds immediately after a cold start with a cold ambient air temperature. When my car is idling, the heater blows cold air. I notice a differance in temperature when I run the temp control from cold to hot, but it doesn't get hot, just warm. I have an 04 fx4 screw that blows ice cold air at idle and while moving. An overcharged car AC system can start out pumping cold air. Any insights would be appreciated. The cooling fan in the condenser is the first thing 2. So I took that radiator fan and put it on the car, and just hooked up a very simple on/off switch to the fan and put that switch on my dash. Heater blows cold air when at idle but heats up when moving? It's blows cold air when at idle even when the car engine heats up. The coolant flows through the heater core while the fan, also known as the blower, blows air through the heater core's fins. ? I have a 2001 GMC Yukon, the A/C will not blow cold air when car is stopped, only when in motion. It justs blows cold air out when the car is at idle. However as soon as I step on the gas the air gets hot, like really hot. 2 possibilities. Intermittent Heat. Most people would like to see frigid cold air blasting from their small dash vents instantly upon request. If you don’t have a manual, or if it lacks such instructions for performing a coolant flush, follow these steps to flush and change the coolant without endangering the environment. I dont think it is a thermostat problem. Without air in the cylinders, your car would just sit there taking up space. An A/C performance check is the easiest way to uncover what's plaguing your car air conditioner. even when I turn the A/C off. Bought a 2002 TJ Wrangler over the summer and love it. 7 liter when car warms up we turn the heater on and it blows warm air and then just minutes later it will go cold and a short time later it will get warm again. Also, when at idle if pop it into neutral (or keep it in Park) and rev it just a little it immediately starts blowing cold air. Diagnosing the reason that your air conditioning isn’t working will help you determine whether the problem is one that you can fix yourself or if you need to take it to a repair shop. So as I sit there, let it idle, all guages normal, heater on HOT and HIGH, it blows cool air. Also my car does not idle good seems to sputter at slow speeds. The AC is now cold but only when the car is sitting idle. The vents blow cold air when i am sitting at a stop light idle for more than a minute. Chevrolet Impala Car Repair Questions. i have not had a chance to get pressure readings yet. That could mean you're low on coolant or one or more water pump impellers is broken. I have a 2002 buick rendezvous it blows cold air when at idle and warm air when driveing. Until the coolant warms up, not fully but say when the temp gauge starts to move, blowing cold outside air through the heater core will just make you colder as the air is moving. I can have the car set and idle for 45 minutes and the car is still blowing out. Why heater in 2008 pontiac montana blows cold air when idling? It's fine when moving, have flushed system,put in new recirc pump,took out tee and nothing worked Follow. An overcharged car AC system can start out pumping cold air. I have an intermittent problem with my 93 LS400. Adversely also the temp has a tendency to drop on the open highway (if there's any left out there!!) due to the free flow & air passing through rad. You can usually diagnose and fix the problem yourself in about an hour. Heater still blowing cold air? When cooling systems are re-filled (after thermostat replacement for example) air can get trapped and that trapped air can prevent normal circulation of coolant. If your car has no heat, not only would the inside of your car feel like an ice box, but a broken heater can prevent your defroster from blowing warm air to your windshield to eliminate ice and fog, which can. Some of them turn on AC to warm up car, then should shut it off on warm up. com > Forum > Tags Find solutions to your heater blows cold air idle chrysler 300 question. If you stop at a red light or stop. Car and Truck Air Conditioning and Heater Parts Automotive air conditioning parts and heating components can keep temperatures inside trucks and cars comfortable in hot summers and cold winters. Air Condition is not blowing cold air anymore, reduction over time; Air Condition suddenly stop blowing cold air ; Air Condition blows mostly cold air, but sometimes it blows warm air ; Air Condition blows air that has a mildew odour ; You can drive your car, visit AC specialized repair shop soon. The cooling fan in the condenser is the first thing 2. the hoses going through the firewall were cold and there is still no heat. Idle Air Controller, a motor-driven valve which controls intake air to maintain idle RPM in internal combustion engines the iac does not meter anything on its own, so it is not a meter. 2004 Mtsubishi Eclipse - Heater blows cold air while sitting idle. Does anyone have a clue???. carcomplaints. Heater does not blow hot air, whether driving on highway or doing light driving. Temp is at Max and it will go away after driving again after a few minutes. It would blow cold air when I first started the car with a cold engine but as the engine began to get hot after driving for a while it would start blowing hot air out the vents. Finally! The crisp, cold chill of winter has set in, bringing cozy sweaters, hot cocoa… and cars that won’t start. 2002 VW Jetta 1. I recently had the thermostat changed and the mechanic also did the bleeding to disperse any air locks/bubbles. i have a 2002 honda civic 1. a quick way to determine coolant flow to your heater core is idle your engine and grip one of the heater hoses going to your firewall,you should feel pulses of anti freeze traveling through the. They replaced Water pump, 2 thermostats, trying to burp the air pocket out, even raised front of car. what the op described its pretty much exactly what happend to me with my z. It doesn't do this all the time but more often than not. Not hot or warm where it would be comfortable. When I start the car, let it idle, the coolant temperature guage goes to the exact spot where it always has since it was new, and seems to be normal, but when I turn the heater on it blows "somewhat cold" air. Another cause of AC blows cold then warm. My problem is that the blower will only blow cold air, but when you apply gas and rev up the engine, the air will begin to get warm, but if brought back down to idle, the air will slowly become cold again. Car Air-conditioning Compressor. Reader Question: My air conditioner is not cold enough at idle sitting at a stop sign, but gets colder when I get on the freeway. My 2002 Dodge Stratus has approximately 90,000 miles on it. The hotter the air that is flowing into your air conditioner from the outside, the the colder you will have to set the air conditioner thermostat to cool off the air inside. - 2008–2012 Jeep Liberty. The A/C only seems to blow cold while the car is moving. The fact it comes back on at idle shows it had a bad sensor or controller or bubble in coolant. If your car's heater works fine while driving down the road but the air from the vents becomes cold at idle, you probably have air in the coolant system. Like, outside temp cold air. The heat produced by the hot radiator fluid runs through the heater core and is dispersed into the cabin of the car, heating the car's interior. I have found that cycling the temperature control open/closed will sometimes help (going from blue to red on the dial, cycling the valve), however overall it is blowing cold air at idle. To help you know what to do if your car overheats, here are 5 easy steps. I drive 50 minutes each way to work, and so I am past the 36,000 miles. The car now has an issue with the heat, it blows cold until you turn it to cold then warm air comes out for about 10 seconds. The cooling fan in the condenser is the first thing 2. if it help my top hose is hot while my bottom hose is cold also my radiator cap be cold when the car is over heating. After getting my house heating fixed my car heating has decided to give up. I would have to disagree. Especially during hot humid summer days. Once you start driving, engine vacuum goes down and the air mix door returns to the 'cold' position. There's a control in heater hose[plastic with vacuum port] with no vacuum line attached. If the AC blows cold then warm condition was caused by moisture in the system, you won't notice a decrease in airflow and you won't see a puddle of water after shutting off the vehicle. According to the mechanic, they have detected carbon monoxide in the coolant, and the coolant was low. To be clear: car is warm, system is blowing hot air (once up to temp), system set to 21 C, vent selection doesn't seem to matter, sometimes as far into our drive as 30+ minutes if we stop for as little as 30 to 45 seconds, the system will start blowing cold air. I have to drive it about a mile for the air to start to heat up. In the summer the temp gauge is all over the place when at idel the temp will go higer but then goes down to normal when driveing. The car now has an issue with the heat, it blows cold until you turn it to cold then warm air comes out for about 10 seconds. The engine temp is getting up to normal but still the heater is blowing cold air. it's already down in the freakin 40's here. The cold air blowing at low RPM's is caused by air in the line that gets trapped at the high point, which is where the heater control valve is located. Learn more about Nissan Pathfinder at the Edmunds. I don't have the gauges to see if pressure is OK on my van. not sure if thermostat was replaced, car never heats up or shows hot as if thermostat is sticking. I will maybe try jacking it WAY up into the air and let it run withe the rad cap off for a while, I would LOOOOOOOOOOVE to get full heat back again. heater blows cold when idling Altima Car Forums heater blows cold when idling - Car Forums and Automotive Chat Automotive Forums. The stat was changed at the same time with new antifreeze. Heater blows cold air at idle When I start my zj to let it warm up, it only blows cold air till i start driving. The heat blows warm air when heat is on and not hot. Sign In My daughter has a 2004 Mitsubishi Eclipse and when she starts the car on cold mornings the heater blows cold air and dosen't get warm until she is driving it and it gets about 2000 RPM's. Why Would a Car Only Overheat at Idle? In order to understand why a car might overheat at idle, but be fine when you're driving down the road, it might be helpful to understand how the cooling system works. My Accord is always ice-cold, whether the car is idle or moving. Sometimes, it is okay if I wait 15 minutes, but if I'm in a hurry, this method doesn't work. During boost, or WOT the car is running just fine with no signs of overheating. My problem is that the blower will only blow cold air, but when you apply gas and rev up the engine, the air will begin to get warm, but if brought back down to idle, the air will slowly become cold again. I can have the car set and idle for 45 minutes and the car is still blowing out. When the mercury begins to rise outside, it’s common for car engines to get overly toasty too. It blows cold air when at a stop light or at low speeds. If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. Trust me if 134A did not blow cold at idle there would be lots of very abgry customers. Hopefully it's just air in system after flushing but I just went through the above (water pump was good though). Then again, I only do that in the summer. This is a discussion on A/C not blowing cold air at idle within the RAM 1500 Diesel General Discussion forums, part of the RAM 1500 EcoDiesel Forum category; Originally Posted by Omarf4 So, looks like a dealer visit despite doing all the troubleshooting and effort here, they'll probably still keep the truck for. Is this normal for a Sunbird. When testing the O2 sensor’s heater circuit, I found using a #7440 incandescent light bulb and socket very helpful. A flow indicates a good pump. I have a 2005 Ody LX with 39k miles that I just purchased used about a month ago. Question being: is this the compressor that has gone bad?. Low-level of Freon. What you can do is check whether the electric cooling fan that sits beside the condenser is running. If the compressor is shutting off, it could be a faulty pressure switch or too much refrigerant in the system or a plugged condensor. From a cold start, your vehicle’s thermostat will stay closed and you won’t notice any coolant flowing into your radiator.