AC blows warm air when idle.
Why does my AC blow warm air when sitting idle, but cool air when driving.
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The problem is most likely low freon, overheated engine, or condenser fan.
Check your freon levels. If low, recharge.
Does your engine continually run on the hotter side? If so, then check your coolant levels.
Otherwise, the issue is most likely the condenser fan is not working. When you are driving, there is sufficient air passing over the condenser to cool it, but when you are at idle, the fan is the only thing to move the air.
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When driving, ambient air passes through AC condensor at MPH speed adding "wind chill" to remaining refrigerant in the system. To function correctly, refrigerant R-134A must be at capacity and AC compressor must function. Air temp at vents inside will be about 34-degress F.
Check refrigerant pressures, fuses, relay, fans, mode control. All must work for cold inside.
- de William Leupold