What are the reasons for a diesel car's air conditioning not cooling?

1 Answers
BriellaDella
07/30/25 9:07am
Here are the reasons why a diesel car's air conditioning may not be cooling: 1. Refrigerant: Refrigerant leakage (manifested as both the indoor and outdoor units working, the compressor also working, but with no effect). 2. Compressor: The compressor capacitor is damaged or faulty, causing the compressor not to work (the phenomenon is similar to the above, but the compressor does not rotate and overheats). 3. Room temperature sensor: The resistance value of the room temperature sensor changes, causing the outdoor unit of the air conditioner not to work (the phenomenon is the same as when the air conditioner stops after reaching the set temperature). 4. Remote control: The remote control is faulty or the air conditioner receiver is faulty (manifested as the air conditioner not responding when turned on, or working intermittently). 5. Four-way valve: The four-way valve (single-cooling units do not have this fault) or the compressor's high and low pressure air is mixed, the air conditioner works but has no effect (the phenomenon is the same as the first one). 6. Air conditioner: The control board of the indoor or outdoor unit of the air conditioner is faulty, causing the air conditioner not to cool (manifested as no response when turned on or erratic operation). 7. Live and neutral wires: The live and neutral wires of the air conditioner power supply are reversed (a few air conditioners may have this fault, usually during installation).
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