What are the reasons for the car air conditioner not cooling?

[McEmilia]

The reasons for the car air conditioner not cooling are: 1. The compressor lacks refrigerant; 2. The compressor lacks oil; 3. Internal damage to the air conditioning pump; 4. Excessive refrigerant charge in the air conditioning system; 5. Blockage in the refrigerant pipeline; 6. Fault in the refrigeration system circuit; 7. Damage to the thermostat interface. The methods to address the car air conditioner not cooling are: 1. Add air conditioning refrigerant; 2. Check the pipelines, air conditioning pump, condenser, and evaporator in the car air conditioning system for any damage causing refrigerant leakage; 3. Inspect the compressor; 4. Clean or replace the air filter. The maintenance methods for the car air conditioner are: 1. Choose an appropriate air conditioning temperature; 2. Control the direction of the air outlet; 3. Avoid prolonged operation; 4. Avoid smoking when the air conditioner is on; 5. Avoid using the air conditioner at low speeds; 6. Turn off the air conditioner before shutting down the engine.