What Causes the Air Conditioning Not to Cool When the Car is Idling?
1 Answers
Here are the reasons why the air conditioning does not cool when idling: Refrigerant leakage in the air conditioning system: Refrigerant leakage leads to insufficient refrigerant, causing the air conditioning to fail to cool. The solution is to add refrigerant along with fluorescent dye. After the vehicle has been used for a period, inspect the air conditioning system with a specialized fluorescent lamp. If there is a leak, the leaking point will glow, and the leaking part or component should be repaired or replaced. Low engine speed: When the car is idling, the engine speed is low, causing the compressor speed to also decrease. Combined with insufficient refrigerant, the instantaneous pressure cannot reach the standard state, resulting in excessively low high pressure and the air conditioning not cooling. Observe through the sight glass on the dryer tank. During normal operation of the air conditioning, if continuous bubbles appear in the sight glass, it indicates insufficient refrigerant. If bubble flipping occurs, it means the refrigerant is severely insufficient and needs to be added. Damaged expansion valve: A damaged expansion valve prevents the system before the valve from forming high pressure, and the high-pressure refrigerant cannot reach 150 Kpa. As a result, the evaporator after the expansion valve cannot cool down, leading to ineffective air conditioning. Internal wear of the air conditioning compressor causes the pressure between the compressor and the expansion valve to fail to reach 150 Kpa to 200 Kpa, preventing the refrigerant in the system from circulating normally and causing the air conditioning to not cool. If severe internal wear of the air conditioning compressor is found, replacing the compressor will resolve the issue.
