1. Low Refrigerant Level:
- Insufficient refrigerant can cause the AC system to blow warm air. Check the refrigerant level using a pressure gauge. If it's low, you may need to recharge the system.
2. Faulty Compressor:
- The compressor is responsible for circulating the refrigerant. A malfunctioning compressor can lead to warm air blowing from the vents. Check the compressor's clutch to see if it's engaging properly.
3. Clogged Condenser:
- The condenser is responsible for dissipating heat from the refrigerant. If it's clogged with debris or dirt, it can cause the AC system to blow warm air. Clean the condenser using a condenser cleaner.
4. Faulty Expansion Valve:
- The expansion valve controls the flow of refrigerant into the evaporator. A faulty expansion valve can cause the AC system to blow warm air. Check the valve's operation to see if it's opening and closing properly.
5. Faulty Blend Door:
- The blend door controls the mixture of warm and cold air entering the cabin. A faulty blend door can cause the AC system to blow warm air. Check the blend door actuator to ensure it's functioning correctly.
6. Bad AC Fan or Blower Motor:
- A non-functioning AC fan (also called a blower motor) will prevent heated air from the inside of the car from being circulated. As a result, you'll only feel hot air coming through the vents.
