What are the reasons for the car air conditioning compressor not shutting off?
2 Answers
Reasons for the car air conditioning compressor not shutting off: 1. The car air conditioning temperature is set too low, causing the compressor not to shut off; 2. The temperature sensor fails, leading to the compressor not shutting off; 3. The thermostat on the air conditioning internal unit's control board is faulty, causing the compressor not to shut off; 4. The air conditioning refrigeration system has a refrigerant leak, resulting in insufficient cooling temperature and causing the compressor not to shut off. After turning on the air conditioning, if the refrigeration system works normally, the fault should be a thermostat malfunction, and the thermostat system should be checked. First, check whether the temperature sensing tube connected to the thermostat has fallen off. If it has, it should be fixed back in place. Second, after prolonged use, the internal contacts of the thermostat may become sintered, the control fluid inside the thermostat may leak, or the thermistor of the electronic thermostat may change its value.
With years of experience in auto repair, I've encountered numerous cases where car air conditioning compressors fail to shut off, often due to issues with the temperature control system. For instance, a faulty thermostat or sensor, which should normally stop the compressor when the temperature drops to the set value, may cause it to run continuously when malfunctioning. Another common culprit is a stuck relay or switch, keeping the circuit engaged and the compressor running non-stop. I've also observed that insufficient refrigerant or low pressure can trigger the system to keep the compressor running in an attempt to enhance cooling, inadvertently overburdening and overheating the compressor, leading to potential damage. Additionally, short circuits in electrical wiring or faults in the air conditioning control unit might also cause this issue. This not only wastes fuel and drains the battery but also shortens the air conditioner's lifespan and increases repair costs. I recommend immediately turning off the air conditioning switch and checking simple components like fuses and sensors, but it's best to visit a professional repair shop as soon as possible for a proper diagnosis with specialized equipment to prevent minor issues from escalating into major repairs. During routine maintenance, don't forget to regularly check air conditioning parameters and service the refrigeration system to effectively prevent such troubles.
