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Why is the car air conditioner not cooling?

2 Answers

OAthena

07/29/25 8:14am

Reasons why the car air conditioner is not cooling: 1. The compressor protection device trips; 2. Poor heat dissipation; 3. Blockage in the pipeline system; 4. Accumulation of dust and scale on the evaporator or filter; 5. Lack of refrigerant in the air conditioner; 6. Failure of the control circuit board; 7. Overload or incorrect information from the temperature sensor; 8. Loose or poor contact in the power wiring; 9. Burnout of the starting capacitor or compressor starting coil. The car air conditioning system mainly consists of components such as the compressor, electronic control clutch, condenser, evaporator, expansion valve, liquid storage dryer, pipelines, condenser fan, vacuum solenoid valve, idle speed controller, and control system. These components are connected into a sealed system using copper pipes, aluminum pipes, and high-pressure rubber hoses.

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MacEva

08/12/25 11:26am

Last time my car's air conditioning suddenly stopped cooling, it was unbearable driving in the summer heat. After inspection, the most common issue was refrigerant leakage, likely caused by aging and cracked system hoses that let all the coolant escape. Replacing the new hose fixed the problem. Compressor failure is also common—if it doesn’t make noise or operate when starting, the cooling stops completely. A non-functioning fan can also reduce cooling efficiency, making the airflow weaker. I regularly clean the AC filter because dust buildup can block airflow and reduce cold air output. If not repaired promptly, driving in extreme heat can be dangerous and lead to heatstroke. During routine maintenance, I always check refrigerant levels and filter conditions to prevent issues.

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