Why does my AC not cool when idling?

Overheated engine. Another common reason for car air conditioner not blowing cold air when idling is an overheated engine. … When the car is already overheated and the fans in the radiator and condenser are not working properly for some reason, the system can’t cool down the heat with the maximum efficiency.

Why does my air conditioning only work when my car is moving?

When the car is moving, versus stopped, there is more air flow over the condenser (the heat exchanger in front of the radiator) and that airflow is essential to system operation. … Other possibilities are that the compressor clutch is not cycling as intended or that the condenser might be blocked or dirty.

Why does my AC go warm when idling?

Your AC system is low on refrigerant. Since the AC compressor is driven by the engine, it doesn’t pump as much refrigerant when you’re at a stop or driving slowly. If the system is low on refrigerant, it will show up as AC blows warm at idle and blows colder when the engine is running at higher RPMs.

Why does my car AC get colder when I drive?

During idle (at stop), the condenser depends on the external AC fan to pass air across the fins to provide the cooling. When driving, the forward motion will cause ambient air to move across the condenser with the AC fan working or not.