My car has an automatic transmission. Anyone know why the heater only works when the car is moving? As it idles the heater blows out cold air when I accelerate it stays warm as long as its being accelerated. If I stop at a light it gets cold again. There are exceptions. When sitting idle, only cold air blows out but once I get going, it gets warm. I had a 1980 Ferrari that did not come stock with AC. So your car's AC was doing fine for the longest time. Q: My car AC blows cold air when the car is moving but when I'm at a red right it starts blowing warm air. When I come to a stop light, or let off the gas, the air coming out of the vents immediatley goes back to cold....even when the temp is turned all the way to 'hot'. Freon AC Refill: http://amzn.to/2HPlaLAHow to fix car blowing hot air when AC is on. A well-functioning car air conditioning system can make your ride more comfortable, especially during summer time. It does have the same blow strength as always is simply the heat and also the cooling temperatures that are the problem and it just started. I’ve checked, it has freon. If you’re stuck in traffic one hot day and your air conditioning is not working, it can be a hellish experience. 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. What is wrong with it? I start my 2001 Saturn in the morning and after 15min it's still not blowing hot air. I have a 1995 GMC Sierra 500, the heat only blows hot when the truck is idling, when you get up to say 30 mph or 35 mph it will only blow cold air. If I let off the gas, the air gets cold. Most cars do not have AC vents, only climate control vents. But once I’m idle-ling, it blows hot air again. When that happens, the HVAC system can be stuck on blows cold air or blows hot air. No one can tell me what it is. My slowly deteriorating 95 BMW 325i has been having some AC/heater problems lately. What could the problem be? My car has 165 miles. One of the first things you will notice is warm air coming from your car … A car’s cabin will heat up as the engine’s coolant heats up. My 2014 Nissan Altima’s air conditioner works normal when it’s cool out, like in the morning. But if you’re a DIYer, you may not prefer it. It was added by the dealer. It also only seems to blow heat when I'm accelerating. Which means that they blow what ever air is selected. Once I leave work, the temperature outside is 90+, my air conditioner will blow cold only when I am accelerating. 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. In a dual zone system, you wind up with a blows cold one side, hot on other side condition. My chrysler 300 2007 has had almost the same problem for 3 yrs. ), so the temperature actuators generally fail first. The coolant absorbs the heat from the engine, causing it to become hot. Drivers changed air temperature far more often than they change the mode (defrost, floor heat, dash vents, etc. Sometimes, car air conditioner blowing hot air instead of cold air. I have a similar issue and would like to add detail. Only after I start driving then it gets warm. And you need to know how to solve the problem immediately. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. Not sure what this is, but I've noticed recently that when I turn the heat up inside the car, the only time it blows warm/hot air is when the car is accelerating. Start driving then it gets warm at a light it gets warm stop... I let off the gas, the HVAC system can be a hellish.! 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