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Q: Where Is the Air Bleeder Valve Typically Located?

A: The air bleeder valve, also known as an air release valve, releases trapped air from the air conditioning (AC) system. It allows the system to have the correct volume of liquid to distribute cold air into the cabin.

The valve is usually near the back of the engine at the highest point of the cooling system. It’s a small housing with a bleeder nut that looks like a bolt, usually in the shape of a hexagon.

Note that not all vehicles have an air bleeder nut, especially newer models.

Tips on How to Access the Air Bleeder Valve

Locating the bleeder nut can get tricky due to how small it is. One way to spot it is by searching for the cooling system first and looking for the bleeder nut. Some models have the valve on top of the thermostat housing, so it may be worth looking for that first.

If you want to remove or replace the bleeder valve, simply turn the attached air bleeder nut counterclockwise. Opening the valve while the engine is running after a coolant change allows air to escape out of the system, preventing it from overheating.

Afterward, make sure you place it back tightly by turning it clockwise. Failure to do so may result in a loose air bleeder nut.

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CarParts Research Team
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The Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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