What to Do When the Car Air Conditioning Stops Cooling?
2 Answers
Solutions for when the car air conditioning stops cooling: 1. Check the coolant temperature: When the car ECU detects that the water temperature is too high, it disconnects the compressor control circuit, preventing the compressor from working, resulting in no cooling. 2. Check the engine speed: A normally functioning car, whether idling or accelerating, operates within a controllable range. If the engine speed is below 600 RPM or above 5500 RPM, the compressor will not work. 3. Check the air conditioning system pressure: The car air conditioning system has high and low pressure lines. There is a pressure switch in the high-pressure line. If the system pressure is too low or too high, the pressure switch disconnects to protect the compressor, preventing it from engaging, and the compressor stops working. 4. Check the evaporator temperature: The evaporator has a temperature sensor. When the sensor detects a temperature below 3 degrees Celsius, the car ECU will also disconnect the compressor relay, preventing the compressor from working.
I just encountered an issue with the air conditioning not cooling last month, and the weather was unbearably hot. Don’t panic—first, check a few things yourself. Pop the hood and see if the AC compressor belt is loose, then inspect the condenser fins to see if they’re clogged with willow catkins. If these seem fine, it’s likely low refrigerant. Remember to start the car and turn on the AC, then feel the low-pressure line—if it’s at room temperature, you’re low on Freon. In my case, it turned out to be a condenser leak, which cost me 300 yuan to fix. I recommend cleaning the AC filter every six months to avoid ending up like me—wasting both money and effort.
