Why does the car air conditioner not cool at idle but cools when accelerating?

1 Answers
Abigail
07/29/25 6:59pm
Reasons why the car air conditioner does not cool at idle but cools when accelerating: 1. 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 150Kpa, which results in the evaporator after the expansion valve not cooling down, leading to the air conditioner not cooling. 2. Internal wear of the air conditioner compressor: This causes the pressure between the air conditioner compressor and the expansion valve to not reach 150Kpa~200Kpa, preventing the refrigerant in the system from circulating normally, resulting in the air conditioner not cooling. 3. Idle speed is too low: The car's computer determines that turning on the air conditioner at this time may cause the engine to stall.
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