What Causes a Car Air Conditioner to Heat but Not Cool?

[VanMartin]

The reasons why a car air conditioner heats but does not cool are: 1. The compressor lacks refrigerant; 2. The compressor lacks oil; 3. Internal damage to the air conditioning pump; 4. Excessive refrigerant in the air conditioning system; 5. Blockage in the refrigerant pipeline; 6. Fault in the cooling system circuit; 7. Damaged thermostat interface. The solutions for a car air conditioner that heats but does not cool are: 1. Add air conditioning refrigerant; 2. Check the pipelines, air conditioning pump, condenser, and evaporator box in the car air conditioning system for damage that may cause refrigerant leakage; 3. Inspect the compressor; 4. Clean or replace the air conditioning filter. Methods for maintaining a car air conditioner include: 1. Choose an appropriate air conditioning temperature; 2. Control the direction of the air vents; 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.