GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Astro - 2WD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Auxiliary Air Conditioning Evaporator Front Tube Replacement

Removal Procedure
  1. Remove the 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. Raise the vehicle.

    4. Object Number: 280394 Size: SH
  4. Remove the auxiliary evaporator front inlet tube from the evaporator inlet tube (2) at the accumulator.
  5. Remove the O-ring seal.

    6. Object Number: 280432 Size: SH
  6. Remove the auxiliary evaporator front inlet tube (2) from the auxiliary evaporator side inlet tube.
  7. Remove the O-ring seal.
  8. Remove the bolts (3) that retain the clips on the auxiliary evaporator front inlet tube (2) to the body.
  9. Remove the auxiliary evaporator front inlet tube (2) from the vehicle.

Installation Procedure

    Object Number: 280432 Size: SH
  1. Install the auxiliary evaporator front inlet tube (2) to the vehicle.

    2. 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.

  2. Install the bolts that retain the clips on the auxiliary evaporator front inlet tube (2) to the body.

    3. Tighten
    Tighten the bolts that retain the clips on the auxiliary evaporator front inlet tube (2) to 5 N·m (44 lb in).

  3. Install the new O-ring seal.

    4. Coat the O-ring seal with 525 viscosity refrigerant oil.

  4. Install the auxiliary evaporator front inlet tube (2) to the auxiliary evaporator side inlet tube.

    5. Tighten
    Tighten the fitting to 27.5 N·m (20 lb ft).

  5. Install the new O-ring seal.

    6. Coat the O-ring seal with 525 viscosity refrigerant oil.


    Object Number: 280394 Size: SH
  6. Install the auxiliary evaporator front inlet tube to the evaporator inlet tube (2) at the accumulator.

    7. Tighten
    Tighten the fitting to 27.5 N·m (20 lb ft).

  7. Lower the vehicle.
  8. Evacuate and charge the system. Refer to Refrigerant Recovery and Recharging
  9. Ensure that no leaks exist in the system.
  10. Install the air cleaner. Refer to Air Cleaner Assembly Replacement in Engine Controls.