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