I had a 1980 Ferrari that did not come stock with AC. Either way, you don’t want to drive around with a vehicle that is leaking coolant. Temp stays normal. My car has 165 miles. It blows cold air when at a stop light or at low speeds. But if you’re a DIYer, you may not prefer it. Most cars do not have AC vents, only climate control vents. Can't charge what it is worth! This can happen externally to the engine or internally. The lack of heat being generated by your system may indicate a clogged heater core. can someone help? what the op described its pretty much exactly what happend to me with my z. i started noticing the heater didn't seem to blow as hot when not moving but thought i was just crazy. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. it's just weird that as long as i'm at atleast 2-3k, it blows hot air but when i'm idling (~850rpm), its just normal air. There are two main issues in the condenser that can lead to a car AC system blowing hot air. The heating system in your car is supposed to keep the atmosphere warm. If your car AC performance seems to degrade slowly, that's probably a best-case scenario for you. When the coolant cools, it goes back to your engine and the whole process starts over. Think there might be a crack in the gasket, or the sleeve the actual valve is in because when I try and turn it, the whole thing spins. This vital fluid is what keeps your car from overheating. Like having a blocked condenser, having broken cooling fans can cause a lack of cooling at your condenser and could cause your car AC blowing hot air. When the system is low on refrigerant, though, this liquid refrigerant lingers in the evaporator and is exposed to more hot air from the cabin. Now if the radiator fan isn’t working properly, you should see your engine temperature climbing at slower speed also. You're right about the t-stat. Out of Coolant. I'm not getting heat when the heater is engaged. Any degree of blockage in the system can lead to the condenser not being able to execute its … Low Refrigerant Levels. Has there been any leaking from the hoses? Its as if the compressor only work after the car is driving for a few minutes. In most cases, it's due to a loss of refrigerant in the system. There are exceptions. Dysfunctional Thermostat. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. Sometimes, car air conditioner blowing hot air instead of cold air. This is the reason that it takes a while for heaters to start blowing warm air. If it needs a T-stat, good luck, the local dealer here doesn't even replace them! Sometimes, car air conditioner blowing hot air instead of cold air. In most cases, it's due to a loss of refrigerant in the system. YOU HAVE AN AIR BUBBLE IN THE COOLING SYSTEM!!! The AC in your car works in the exact same fashion as your AC at home, or your refrigerator. No temp/ overheating probs, no strange noises/ leaks, no warning lights. A defective condenser fan. Or blow them out with a compressor maybe? Could be water pump. All I have to do to get hot air again is give it a little gas, say 200 more rpms, and the heater immediately responds with warmer air, hot air if I maintain 1000 rpms. If your car AC blows cold air when driving at highway speeds but turns warm at stop lights or when driving at slow speeds, you may have a bad radiator fan or radiator fan relay. There could be several reasons behind this problem. Recheck the coolant level, again. Hot coolant from the engine passes through a heater core, which looks and functions a lot like a small radiator, and a blower motor forces air through it.