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What is wrong if your AC suddenly will only blow air from the heater vent below dash?

There are a few possible reasons why your AC suddenly will only blow air from the heater vent below the dash.

1. Faulty blend door: The blend door is a flap that controls the flow of air from the AC vents and the heater vents. If the blend door is stuck in the closed position, it will prevent air from flowing through the AC vents.

2. Faulty AC actuator: The AC actuator is a small motor that opens and closes the blend door. If the actuator fails, it will be unable to open the blend door, which will prevent air from flowing through the AC vents.

3. Low refrigerant level: If the refrigerant level in your AC system is too low, it will not be able to cool the air that flows through the AC vents. This can cause the AC to blow warm air instead of cool air.

4. Faulty compressor: The compressor is the heart of the AC system. It compresses the refrigerant gas and circulates it through the AC system. If the compressor fails, it will not be able to compress the refrigerant gas, which will prevent the AC system from cooling the air.

If you are experiencing any of these problems, you should take your car to a qualified mechanic to have the issue diagnosed and repaired.