High Pressure Safety Valve HVAC: Service and Repair

Compressor Pressure Relief Valve Replacement

REMOVAL PROCEDURE

IMPORTANT:
^ When servicing the compressor, keep dirt and other foreign material from getting on the compressor parts and into the system Clean tools and a clean work area are essential for proper service. keep the compressor and the parts clean at all times. Any parts which are to be reassembled should be cleaned with Trichloroethane, naphtha, kerosene, or an equivalent solvent. Air dry the parts and wipe clean with a lint-free cloth.
^ All repairs and procedures for the compressor must be performed after the A/C system refrigerant has been discharged and recovered, and after the compressor has been removed from the vehicle.
^ When the compressor is removed from the vehicle for servicing, drain and discard the oil remaining in the compressor. Add 90 cc (3.0 fl oz) of new refrigerant Oil when the repairs are complete.

1. Replace the pressure relief valve if it is open. Inspect for signs of refrigerant leakage.
2. Discharge and recover the refrigerant. Refer to Refrigerant Recovery and Recharging.
3. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in Service Precautions.
4. Remove the pressure relief valve (2) from the compressor.
5. Discard the O-ring (3).

INSTALLATION PROCEDURE
1. Lubricate the O-ring (3) with 525 Viscosity mineral oil.
2. Install the O-ring on the pressure relief valve (2).

NOTE: Refer to Fastener Notice in Service Precautions.

3. Install the pressure relief valve to the compressor.

Tighten
Tighten the pressure relief valve to 12-18 N.m (8.8-13 lb ft).

4. Lower the vehicle.
5. Evacuate and recharge the air conditioning (A/C) system. Refer to Refrigerant Recovery and Recharging.
6. Operate the A/C system and inspect for refrigerant leaks. Refer to Leak Testing.