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Why does your car cut off when you turn on ac?

Your car should not cut off when you turn on the air conditioning. If this is happening, it is likely due to an issue with the electrical system or the air conditioning compressor. Here are a few possible causes:

1. Low refrigerant level: If the refrigerant level in your car's air conditioning system is low, it may not be able to cool the air properly and the compressor will work harder to compensate. This can strain the electrical system and cause the car to cut off.

2. Electrical fault: There may be a fault in the electrical system that is causing the car to cut off when the air conditioning is turned on. This could be due to a bad connection, a faulty relay, or a problem with the alternator or battery.

3. Compressor failure: If the air conditioning compressor is failing, it may not be able to compress the refrigerant properly and the car will cut off. This is typically accompanied by a loud knocking or grinding noise.

If your car is cutting off when you turn on the air conditioning, it is important to have it diagnosed by a qualified mechanic. They will be able to identify the cause of the problem and recommend the best course of action.