How to Determine if the Car Air Conditioning Pump is Faulty?

[MacDante]

The air conditioning does not cool, and the engine speed does not increase when the AC switch is turned on. Check if the compressor's working voltage is sufficient. If not, there is a circuit fault; if it is sufficient, then the compressor is faulty.

[DiRemington]

When my car's air conditioning system has issues, I always check if the AC pump is faulty first. The AC pump is the compressor, and if it fails, the air conditioning won't cool. Common signs include reduced cooling efficiency or no response when turning on the AC, unusual noises like clicking or humming inside the car, and sometimes vibrations in the engine compartment. I also check if the clutch is engaging properly—start the engine and turn on the AC; if the pump doesn't respond, the clutch might be malfunctioning. Additionally, look for refrigerant leaks, such as oil stains on the ground or a sweet smell. Belt slippage is another signal—feel the belt by hand to see if it's loose. If the pump is broken, it must be repaired promptly, or driving in summer will be unbearable! For repairs, I prefer to leave it to professional shops, as DIY attempts might damage the car. Remember, these signs are more accurate when considered together.