The V7 compressor is equipped with a pressure relief valve which is placed in the system as a safety factor.

Under certain conditions, the refrigerant on the discharge side may exceed the designed operating pressure. The valve is designed to open automatically at approximately 3036 kPa (440 psi) in order to prevent system damage.

Correct any condition that causes the valve to open. Replace refrigerant oil as necessary. Inspect the air conditioning refrigerant pressure sensor for proper calibration. Refer to DTC P0530 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit in Engine Controls-5.7L.