For 1990-2009 cars

### Removal Procedure

1. Remove the air cleaner cover and duct assembly. Refer to Air Filter Element Replacement in Engine Controls.
2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
3. Remove the compressor pressure relief valve (1) from the compressor head.

### Installation Procedure

1. Using a lint-free clean, dry cloth, carefully clean the pressure relief valve seat area of the rear compressor head.
2. Coat the new O-ring with mineral base 525 viscosity refrigerant oil.

Important: DO NOT allow any of the mineral base 525 viscosity refrigerant oil on the new O-ring seal to enter the refrigerant system.

3. Install the new O-ring.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install the compressor relief valve (1) into the compressor head.

Tighten
Tighten the valve to 9 N·m (80 lb in).

5. Evacuate and recharge the system. Refer to Refrigerant Recovery and Recharging .
6. Leak test the A/C system. Refer to Leak Testing .
7. Install the air cleaner cover and duct assembly. Refer to Air Filter Element Replacement in Engine Controls.