Why does the car air conditioner not cool when the accelerator is not pressed?

[DelRyan]

Here are the reasons why the car air conditioner does not cool at idle speed: 1. Belt slippage: The first thing to consider is belt slippage. Since the air conditioning compressor is driven by the crankshaft via a belt, when the belt slips, the transmission efficiency of the air conditioning compressor decreases. The most obvious symptom is poor or even no cooling effect when the engine is idling or running at low speed. Cooling only gradually resumes when the accelerator is pressed and the engine speed increases. 2. Damaged air conditioning compressor: The operation and idling of the air conditioning compressor are controlled by its internal electromagnetic clutch. If the electromagnetic clutch malfunctions, it may cause the air conditioner not to cool at idle speed. Similarly, the cooling effect will slowly recover when the engine speed increases.