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. Anyone know why the heater only works when the car is moving? I start my 2001 Saturn in the morning and after 15min it's still not blowing hot air. I have a similar issue and would like to add detail. What could the problem be? Freon AC Refill: http://amzn.to/2HPlaLAHow to fix car blowing hot air when AC is on. Most cars do not have AC vents, only climate control vents. But if you’re a DIYer, you may not prefer it. Only after I start driving then it gets warm. My car has an automatic transmission. My chrysler 300 2007 has had almost the same problem for 3 yrs. My slowly deteriorating 95 BMW 325i has been having some AC/heater problems lately. 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. Sometimes, car air conditioner blowing hot air instead of cold air. The coolant absorbs the heat from the engine, causing it to become hot. If I let off the gas, the air gets cold. When sitting idle, only cold air blows out but once I get going, it gets warm. There are exceptions. My 2014 Nissan Altima’s air conditioner works normal when it’s cool out, like in the morning. No one can tell me what it is. If I stop at a light it gets cold again. It was added by the dealer. 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. I had a 1980 Ferrari that did not come stock with AC. A car’s cabin will heat up as the engine’s coolant heats up. Which means that they blow what ever air is selected. 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. When that happens, the HVAC system can be stuck on blows cold air or blows hot air. And you need to know how to solve the problem immediately. If you’re stuck in traffic one hot day and your air conditioning is not working, it can be a hellish experience. So your car's AC was doing fine for the longest time. One of the first things you will notice is warm air coming from your car … 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. What is wrong with it? 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. 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'. ), so the temperature actuators generally fail first. 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