Compressor HVAC: Service and Repair

Air Conditioning (A/C) Compressor - 5.0L (4V), 5.4L (4V)





Removal and Installation

NOTICE: If installing a new Air Conditioning (A/C) compressor due to an internal failure of the old unit, the following procedures must be carried out to remove contamination from the A/C system. Failure to remove contamination from the A/C system, if present, will result in poor A/C performance and/or damage to the new A/C compressor and other components.
- If A/C flushing equipment is available, carry out flushing of the A/C system prior to installing a new A/C compressor.
- If A/C flushing equipment is not available, carry out filtering of the A/C system after a new A/C compressor has been installed.
- Install a new Thermostatic Expansion Valve (TXV) , as directed by the A/C flushing or filtering procedure.
- Install a new receiver/drier as directed by the A/C flushing or filtering procedure.

NOTE: Installation of a new receiver/drier is not required when repairing the A/C system, except when there is physical evidence of contamination from a failed A/C compressor or damage to the receiver/drier. Damage to the receiver/drier includes leaks in the receiver/drier, physical damage to the receiver/drier shell or desiccant, or moisture contamination. Moisture contamination results only from a complete loss of refrigerant and equalization of the refrigerant system pressure with atmospheric pressure for a period longer than one hour. If even a slight amount of positive refrigerant pressure is present in the system before repairs are carried out, the receiver/drier should not be replaced.

All vehicles

1. Position the vehicle on a hoist with the gear selector in NEUTRAL.

2. If filtering of the refrigerant system has not been carried out, recover the refrigerant.

3. Remove the drive belt from the A/C compressor pulley.

5.4L (4V) vehicles

4. Disconnect the Crankshaft Position (CKP) sensor electrical connector.

All vehicles

5. Remove the 2 A/C compressor fitting nuts and disconnect the fittings.
- Discard the O-ring seals and gasket seals.

- To install, tighten to 15 Nm (133 lb-ft).


6. Remove the 3 bolts and lower the underbody shield.
- To install, tighten to 10 Nm (89 lb-in).






7. Disconnect the A/C clutch field coil electrical connector and detach the wire harness from the A/C compressor studs and the rear of the A/C compressor.

8. Remove the 3 A/C compressor stud-bolts.
- To install, tighten to 25 Nm (18 lb-ft).


9. To install, reverse the removal procedure.
- If flushing of the A/C system is not to be carried out, add the correct amount of clean PAG oil to the refrigerant system.