What is an AC compressor?
Your car’s air conditioner compressor is an integral part of the AC system. It’s responsible for compressing liquid refrigerant into gas and circulating that gas through the AC system.
The compressor sends high-pressure, high-temperature gas to the condenser, where it releases heat and returns to a liquid state. The liquid refrigerant then flows through an expansion valve or orifice tube, where it turns back into a low-pressure, low-temperature mixture of liquid and gas. From there, the refrigerant travels to the evaporator coil, absorbing heat from the cabin and cooling it before returning to the compressor, where the process starts again.
When should I replace the AC compressor in my car?
There are no set replacement intervals for AC compressors. In fact, your compressor may even last for your vehicle’s lifespan. That said, they can wear out over time, and you’ll need to replace yours when it fails.
Here are the most common signs of a faulty AC compressor:
Warm airflow from vents: The most common sign of a faulty compressor is a lack of cold air flowing from the vents.
Strange noises: A malfunctioning compressor can make strange noises, like grinding, rattling, squealing, or clunking sounds.
Delayed or intermittent cooling: If your AC system takes a long time to begin blowing cold air or the system works erratically, you may need a new AC compressor.
Refrigerant leaks: A damaged compressor can develop leaks. This can result in decreased cooling abilities.
Foul smells: A faulty compressor can release strange odors due to leaking refrigerant or a burned-out clutch.
Vibrations: If you notice vibrations from the engine bay while driving, it may be an indicator that you have a bad AC compressor.
The AC compressor clutch doesn’t engage: If the AC compressor clutch doesn’t engage when you turn on the AC system, it could be a sign of a bad compressor.
Keep in mind: These symptoms can indicate other HVAC issues, like a bad accumulator, a faulty condenser, or even a clogged cabin air filter. The best way to get an accurate diagnosis is to visit a certified mechanic.