What are the reasons for a car compressor not shutting down?

[LeRobert]

Car compressor not shutting down reasons are as follows: Refrigerant issues: The reason why the car air conditioner is not cooling may be due to problems with the refrigerant in the car air conditioning system. Filter blockage: The filter screen of the filter is blocked, increasing the resistance to cooling, resulting in the car air conditioner not cooling. Drier saturation: There is a drier in the car air conditioning refrigeration system, whose main task is to absorb moisture in the refrigerant and prevent excessive moisture in the refrigerant from causing a decrease in cooling capacity. When the desiccant in the drier is saturated, moisture cannot be filtered out in time, resulting in the inability to cool.

[VonArthur]

I've been repairing cars for several years, and the most common reason for a compressor not shutting off is clutch sticking. The clutch is responsible for turning the compressor on and off, and if it gets dirty or worn out, it can get stuck and prevent shutdown. A faulty temperature sensor can also mislead the system into thinking the car is still hot, causing continuous operation. Other common causes include pressure switch failure, wiring short circuits, or relay jamming. I recommend car owners first listen for sounds—the compressor will have a continuous humming noise; check the AC settings to see if it's set to the lowest temperature but keeps running; and perform simple DIY checks for loose fuses and connections. Not fixing it in time can lead to compressor burnout, high power consumption damaging the battery, or even affecting the engine. Regular maintenance, including cleaning the evaporator and condenser, can help prevent these issues.

[WyattMarie]

As a veteran driver with 20 years of experience, I must warn that a non-stop compressor is extremely dangerous. It forces the AC to work continuously, causing coolant temperature to skyrocket and fuel consumption to increase significantly. Common causes include thermostat failure, refrigerant leaks/insufficient levels, or faulty control module signals. If you notice uninterrupted cold air from vents, immediately turn off the AC system to reduce load - otherwise compressor overheating and seizure will cause bigger trouble. Pull over safely to check under the hood for continuous compressor operation (listen for humming); never attempt long-distance driving in this condition. Visit a repair shop promptly for pressure tests and repairs. Remember, prevention is key - get annual pre-summer AC inspections to avoid sudden breakdowns.

[MaryMarie]

I usually take care of the family car, and it gives me a headache when the compressor won't shut off because it consumes too much energy. It's usually due to a faulty temperature sensor misjudging the high cabin temperature or a stuck pressure switch. My habit is to first try adjusting the air conditioning temperature settings, turning it up a bit to see if it shuts off; if the compressor keeps running, the problem is serious. A quick check is to see if the fuse is blown and try replacing it simply. This issue wastes fuel and electricity, so it needs timely attention to avoid higher repair costs. A money-saving tip is to clean the air conditioning filter and check the refrigerant level annually.