Why does the car's cold air conditioning blow out hot air?

[StDallas]

There are several reasons why a car's cold air conditioning may blow out hot air: 1. Incorrect operation method: To activate the car air conditioning's cooling function, the AC switch must be turned on and the temperature must be adjusted to the cooling position. 2. Dirty air filter: A clogged air filter can prevent cold air from reaching the vents. 3. Refrigerant level: If the air conditioning system is overcharged with refrigerant, it can cause excessive pressure in the pipes, leading to frequent compressor shutdowns and resulting in no cooling; or insufficient refrigerant can also cause the air conditioning to not cool. The following are related reasons why the air conditioning may not cool: 1. Slipping compressor belt or electromagnetic clutch. 2. Poor sealing of the air conditioning compressor piston. 3. Clogged condenser. 4. Condenser cooling fan not working or rotating in reverse. 5. Expansion valve malfunction. 6. Lack of refrigerant (commonly known as Freon). 7. Dirty evaporator. 8. Malfunction in the car air conditioning air distribution system. 9. Dirty air filter. 10. Blower fan malfunction.