My car has an automatic transmission. The coolant absorbs the heat from the engine, causing it to become hot. When that happens, the HVAC system can be stuck on blows cold air or blows hot air. My car has 165 miles. It also only seems to blow heat when I'm accelerating. There are exceptions. 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. Freon AC Refill: http://amzn.to/2HPlaLAHow to fix car blowing hot air when AC is on. I have a similar issue and would like to add detail. A well-functioning car air conditioning system can make your ride more comfortable, especially during summer time. 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. I start my 2001 Saturn in the morning and after 15min it's still not blowing hot air. Sometimes, car air conditioner blowing hot air instead of cold air. I had a 1980 Ferrari that did not come stock with AC. Which means that they blow what ever air is selected. I’ve checked, it has freon. If I let off the gas, the air gets cold. A car’s cabin will heat up as the engine’s coolant heats up. Anyone know why the heater only works when the car is moving? It was added by the dealer. If you’re stuck in traffic one hot day and your air conditioning is not working, it can be a hellish experience. 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. If I stop at a light it gets cold again. Once I leave work, the temperature outside is 90+, my air conditioner will blow cold only when I am accelerating. My slowly deteriorating 95 BMW 325i has been having some AC/heater problems lately. But once I’m idle-ling, it blows hot air again. In a dual zone system, you wind up with a blows cold one side, hot on other side condition. As it idles the heater blows out cold air when I accelerate it stays warm as long as its being accelerated. No one can tell me what it is. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. One of the first things you will notice is warm air coming from your car … What could the problem be? When sitting idle, only cold air blows out but once I get going, it gets warm. 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. 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. Only after I start driving then it gets warm. 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. 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