GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Yukon - 4WD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Compressor Sealing Washers Replacement

Installation Procedure

    Object Number: 257968 Size: SH

    Important: Take the following measures when installing sealing washers:

       • Keep dirt and foreign material from the sealing surfaces of the washers, the hose block, and the compressor ports.
            Clean all of the sealing surfaces with a lint-free rag.
       • Do not reuse sealing washers.
       • The sealing washers do not need oiling prior to assembly.

  1. Install the sealing washer onto the pilots of the suction/discharge block fitting.

    2. The washers must bottom against the surface of the block fitting.


    Object Number: 257969 Size: SH
  2. Install the hose block to the compressor.

    3. Make sure the sealing washers are seated within the compressor machined surfaces.

    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.

  3. Hold the block in place.

    4. Tighten
    Tighten the bolt to 34 N·m (25 lb in).