GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Astro - 2WD 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Evaporator 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. Object Number: 280394 Size: SH
  3. Remove the evaporator tube (2) from the evaporator.
  4. Remove the O-ring seal.
  5. Remove the grille. Refer to Grille Replacement in Exterior Trim.
  6. Remove the evaporator tube (2) from the condenser (4).
  7. Remove the O-ring seal.
  8. Remove the evaporator tube from the auxiliary A/C evaporator underbody front tube assembly (if equipped).

Installation Procedure
  1. Coat the O-ring seal with 525 viscosity refrigerant oil.

    2. Object Number: 280394 Size: SH
  2. Install the new O-ring seal.
  3. Install the evaporator tube (2) to the condenser (4).

    4. 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. Tighten the evaporator tube (2) to the condenser (4).

    5. Tighten
    Tighten the evaporator tube connectors (3) to 27.5 N·m (20 lb ft).

  5. Install the grille. Refer to Grille Replacement in Exterior Trim.
  6. Coat the O-ring with 525 viscosity refrigerant oil.
  7. Install the new O-ring seal.
  8. Install the evaporator tube to the evaporator.

    9. Tighten
    Tighten the evaporator tube connectors (3) to 27.5 N·m (20 lb ft).

  9. Install the evaporator tube to the auxiliary A/C evaporator underbody front tube assembly (if equipped).

    10. Tighten
    Tighten the evaporator tube to the auxiliary A/C evaporator to 27.5 N·m (20 lb ft).

  10. Evacuate and charge the system. Refer to Refrigerant Recovery and Recharging .
  11. Ensure that no leaks exist in the system.
  12. Install the air cleaner. Refer to Air Cleaner Assembly Replacement in Engine Controls.