Pressure Relief Valve On A/C Compressor, Checking

The Pressure Relief Valve Protects the Entire Refrigerant Circuit against Excessive Pressure.

CAUTION:

Danger of frostbite from refrigerant. The pressure relief valve drains refrigerant when the engine is running and the refrigerant circuit pressure is too high.

Frostbite on the hands and other parts of the body is possible.

- Wear safety gloves.

- Wear protective eyewear.

- Turn off the engine.

Checking Pressure Relief Valve on A/C Compressor (Sanden)

Fig 1: Checking Pressure Relief Valve On A/C Compressor (Sanden)

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

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.

Checking Check Valve on A/C Compressor (Denso)

Fig 2: Checking Check Valve On A/C Compressor (Denso)

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

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.