E 150 V8-5.4L (2008)
High Pressure Safety Valve HVAC: Description and Operation
A/C PRESSURE RELIEF VALVE
NOTE: If the A/C compressor is operating within limits and the A/C pressure relief valve is venting, or if the A/C pressure relief valve is leaking
around the threads, replace the A/C pressure relief valve and O-ring. If the A/C pressure relief valve still vents after it is replaced, diagnose the
refrigerant system for a restriction.
An A/C pressure relief valve is incorporated in the A/C compressor to prevent damage to the A/C compressor and other system components by relieving
unusually high system discharge pressure buildups. For specifications regarding operating pressure(s), refer to Heating and Air Conditioning.
The A/C pressure relief valve is a separate component and can be replaced separately from the A/C compressor. It is necessary to recover the refrigerant
before removing the A/C pressure relief valve.
