Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pressure Relief Valve On A/C Compressor, Checking
Special Tools And Workshop Equipment Required
- A/C Service Station:VAS6007A (or succeeding model)
The Pressure Relief Valve Protects the Entire Refrigerant Circuit Against Excessive Pressure.
There is a risk of frostbite from the refrigerant. The pressure relief valve drains refrigerant when the engine is running and the refrigerant circuit pressure is too high.
Frostbite on the skin and other parts of the body is possible.
- Wear safety gloves.
- Wear protective eyewear.
- Turn the engine off.
Pressure Relief Valve on A/C Compressor (Denso)
- The pressure relief valve -arrow- has activated if refrigerant oil is found in the close vicinity.
- In this case, check the previously described capacity for the refrigerant circuit.
- Drain the coolant with the A/C Service Station from the refrigerant circuit and fill it up to the specified capacity.
For other A/C compressor manufactures the relief valve is located in a similar place.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.