GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Astro - 2WD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Compressor Sealing Washers Replacement

Removal Procedure
  1. Remove the air cleaner. Refer to Air Cleaner Assembly Replacement in Engine Controls.

    2. Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  2. Disconnect the negative battery cable.
  3. Discharge and recover the refrigerant from the system. Refer to Refrigerant Recovery and Recharging .
  4. Remove the grille. Refer to Grille Replacement in Exterior Trim.

    5. Object Number: 280393 Size: SH
  5. Remove the hose clamp bracket nut from the engine stud.
  6. Remove the compressor and condenser hose bolt from the compressor.
  7. Remove the compressor and condenser hose from the compressor.
  8. Remove the sealing washers.

Installation Procedure

    Object Number: 280389 Size: SH
  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.
  2. Install the compressor and condenser hose (7) to the compressor (4).

    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 (2) to the compressor (4).

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

  4. Install the hose clamp bracket nut (3) to the engine stud.

    5. Tighten
    Tighten the hose clamp bracket nut 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. Ensure that no leaks exist in the system.
  9. Install the air cleaner. Refer to Air Cleaner Assembly Replacement in Engine Controls.