Mustang V8-5.4L SC (2008)
High Pressure Safety Valve HVAC: Description and Operation
A/C COMPRESSOR 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 the
threads, install a new 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 compressor pressure relief valve is incorporated in the compressor manifold and tube assembly (4.0L) or the A/C compressor (4.6L or 5.4L) to
prevent damage to the A/C compressor other system components, and to avoid total refrigerant loss by relieving unusually high refrigerant 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 A/C compressor or compressor manifold and tube assembly.
It is necessary to recover the refrigerant before removing the A/C pressure relief valve.
