GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Astro - 2WD 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Compressor Sealing Washers Replacement

Removal Procedure
  1. Remove air cleaner. Refer to Air Cleaner Assembly Replacement in Engine Controls.
  2. Discharge and recover the refrigerant from the system. Refer to Refrigerant Recovery and Recharging
  3. Remove the grille. Refer to Grille Replacement in Exterior Trim.

    4. Object Number: 280389 Size: SH
  4. Remove the hose clamp bracket nut (3) from the engine stud.

    5. Object Number: 280393 Size: SH
  5. Remove the compressor and condenser hose bolt from the compressor.
  6. Remove the compressor and condenser hose from the compressor.
  7. Remove the sealing washers.

Installation Procedure
  1. Install the sealing washers.
    2. 1.1. Clean the following locations with a lint-free rag before installing the sealing washers:
    1.2. The sealing surfaces of the washers
    1.3. The hose block
    1.4. The compressor ports
    1.5. Do not reuse the sealing washer.
    1.6. Do not oil the sealing washers prior to assembly.
    1.7. Install the sealing washer onto the pilots of the suction/discharge block fitting. Ensure that the washers are seated against the surface of the block fitting.
    1.8. Install the hose block to the compressor. Verify that the sealing washers are seated within the compressor's machined surfaces.
    1.9. Hold the block in place while hand tightening the attachment bolt.

    Object Number: 280393 Size: SH
  2. Install the compressor and condenser hose to the compressor.

    3. 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. Install the compressor and condenser hose bolt to the compressor.

    4. Tighten
    Tighten the compressor and condenser hose bolt to 35 N·m (26 lb ft).


    Object Number: 280389 Size: SH
  4. Install the hose clamp bracket nut (3) to the engine stud.

    5. Tighten
    Tighten the hose clamp bracket nut (3) to 5 N·m (44 lb in).

  5. Install the grille. Refer to Grille Replacement in Exterior Trim.
  6. Ensure that no leaks exist in the system.
  7. Evacuate and charge the system. Refer to Refrigerant Recovery and Recharging .
  8. Inspect the system for leaks.
  9. Install the air cleaner. Air Cleaner Assembly Replacement in Engine Controls.