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What are the reasons for a car's air conditioning compressor not shutting off?

2 Answers

FelixFitz

09/06/25 8:21am

Here are the reasons why a car's air conditioning compressor does not shut off: 1. The car's air conditioning temperature is set too low, causing the compressor to run continuously. 2. A faulty temperature sensor leads to the compressor not shutting off. 3. A malfunctioning thermostat on the air conditioning unit's control board causes the compressor to run non-stop. 4. A refrigerant leak in the air conditioning system results in insufficient cooling, causing the compressor to operate continuously. Here are the troubleshooting methods for a car's air conditioning compressor not shutting off: 1. If the cooling system operates normally after turning on the air conditioning, the issue is likely a faulty thermostat. The thermostat system should be inspected. 2. Check whether the temperature sensing tube connected to the thermostat has come loose. If it has, reattach it to its original position. 3. Over time, the internal contacts of the thermostat may fuse, leading to control fluid leakage in the thermostat and changes in the electronic thermostat's thermistor value.

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Lynne

09/18/25 7:57am

I've been driving for over a decade and often encountered the issue of the air conditioning compressor running non-stop. Last week, my car's AC wasn't cooling properly and kept making a buzzing sound, with the compressor refusing to shut off. I initially thought it was due to the system being overloaded from the hot weather. Later, a friend helped me check and suggested it might be a stuck thermostat failure, unable to sense the temperature changes inside the car. He reminded me that refrigerant leaks or a clogged expansion valve could also cause unstable system pressure, forcing the compressor to work overtime to balance it. This situation not only consumes more fuel but can also overheat the engine compartment, making it more prone to issues during long summer drives. Regular inspections of AC components are crucial—don't wait until the compressor burns out to regret it.

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