What is the reason why the car air conditioner compressor goes up and down?

The car air conditioner may come and go due to the following reasons:
1. The air conditioner radiator is too dirty: Slow heat dissipation from the radiator will cause the air conditioner to crash. The solution is to clean the air conditioner radiator in time.
2. Compressor problem: The compressor starts up and stops for a while, which can also cause this phenomenon. It is recommended that car owners go to a 4S shop or repair shop for repairs.
3. Refrigerant leakage in the refrigerant pipeline: Insufficient refrigerant can also cause the car air conditioner to work intermittently. It is also recommended that car owners go to a 4S shop or repair shop for repairs.
4. The car air conditioning compressor contactor coil is loose: In this case, the car owner also needs to go to a 4S shop or repair shop for repair.
In addition, understanding the four basic processes of how car air conditioners work can also help diagnose problems:
1. Compression process: The compressor absorbs low-temperature and low-pressure refrigerant gas, compresses it into high-temperature and high-pressure gas, and discharges it.
2. Heat dissipation process: High-temperature and high-pressure gas enters the condenser and turns into liquid after dissipating heat.
3. Throttling process: After the refrigerant liquid passes through the expansion device, the volume increases and the pressure and temperature drop sharply.
4. Heat absorption process: The refrigerant liquid enters the evaporator, absorbs surrounding heat and turns into low-temperature and low-pressure refrigerant vapor, and then enters the compressor.