Component Tests and General Diagnostics

Pressure Relieve Valve on A/C Compressor, Checking

• Function: protects refrigerant circuit against excessive pressure.

- When working on the refrigerant circuit, note the information, refer to => [ Refrigerant Circuit, Specialized Repairs ] Procedures.


There is a danger of ice-up.

Pressure relief valve will drain refrigerant with engine running and high pressure in refrigerant circuit.

Turn engine off.

Checking check valve on A/C compressor (Denso)





• The pressure relief valve - arrow - has operated when refrigerant oil is found in the close vicinity.

• In this case, vehicle must be taken to an A/C specialist workshop. Refer to => [ Refrigerant Circuit, Specialized Repairs ] Procedures.