Why does the air conditioning stop cooling when the car is stationary?
1 Answers
When the car is stationary, the air conditioning stops cooling, but it works when the car is moving. Possible causes for this issue include: Damaged expansion valve: This prevents the formation of high pressure in the system before the expansion valve, causing the high-pressure refrigerant to fail to reach 150 Kpa. As a result, the evaporator behind the expansion valve cannot cool down, leading to ineffective air conditioning. Internal wear of the air conditioning compressor: This results in the pressure between the compressor and the expansion valve failing to reach 150 Kpa~200 Kpa, disrupting the normal circulation of refrigerant in the system and causing the air conditioning to underperform. Belt slippage: The air conditioning compressor is driven by the crankshaft via a belt. When the belt slips, the transmission efficiency of the compressor decreases. The most noticeable symptom is poor or even complete lack of cooling at engine idle or low speeds. Cooling only gradually resumes when the accelerator is pressed and engine speed increases. Damaged air conditioning compressor: The operation and idling of the compressor are controlled by its internal electromagnetic clutch. If the clutch malfunctions, it may cause the air conditioning to stop cooling at idle. Similarly, cooling performance only improves as engine speed increases.
