But once I’m idle-ling, it blows hot air again. As it idles the heater blows out cold air when I accelerate it stays warm as long as its being accelerated. ), so the temperature actuators generally fail first. But if you’re a DIYer, you may not prefer it. What is wrong with it? 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. One of the first things you will notice is warm air coming from your car … My 2014 Nissan Altima’s air conditioner works normal when it’s cool out, like in the morning. 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'. If I let off the gas, the air gets cold. It also only seems to blow heat when I'm accelerating. Freon AC Refill: http://amzn.to/2HPlaLAHow to fix car blowing hot air when AC is on. Sometimes, car air conditioner blowing hot air instead of cold air. 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. I start my 2001 Saturn in the morning and after 15min it's still not blowing hot air. Once I leave work, the temperature outside is 90+, my air conditioner will blow cold only when I am accelerating. 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. Most cars do not have AC vents, only climate control vents. I have a similar issue and would like to add detail. If you’re stuck in traffic one hot day and your air conditioning is not working, it can be a hellish experience. I had a 1980 Ferrari that did not come stock with AC. Only after I start driving then it gets warm. My chrysler 300 2007 has had almost the same problem for 3 yrs. And you need to know how to solve the problem immediately. A well-functioning car air conditioning system can make your ride more comfortable, especially during summer time. There are exceptions. My car has an automatic transmission. It was added by the dealer. When that happens, the HVAC system can be stuck on blows cold air or blows hot air. My car has 165 miles. Drivers changed air temperature far more often than they change the mode (defrost, floor heat, dash vents, etc. My slowly deteriorating 95 BMW 325i has been having some AC/heater problems lately. If I stop at a light it gets cold again. So your car's AC was doing fine for the longest time. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. 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. What could the problem be? Anyone know why the heater only works when the car is moving? 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