GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC Suburban - 2WD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Auxiliary Air Conditioning Evaporator Tube Replacement

Removal Procedure
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Remove the air cleaner assembly.
  3. Remove the evaporator tube from the auxiliary evaporator hose.
  4. Remove the O-ring seal.
  5. Remove the refrigerant hose assembly from the auxiliary compressor hose.
  6. Remove the O-ring seal.
  7. Remove the right front wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Front End.
  8. Remove the auxiliary evaporator hose from the auxiliary evaporator.
  9. Remove the O-ring seal.
  10. Remove the auxiliary compressor hose from the auxiliary evaporator.
  11. Remove the O-ring seal.
  12. Remove the screws.
  13. Remove the hose clips.
  14. Remove the auxiliary evaporator hose.
  15. Remove the auxiliary compressor hose.

Installation Procedure
  1. Install the auxiliary compressor hose.
  2. Install the auxiliary evaporator hose.
  3. Install the hose clips.

    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. Install the screws.

    5. Tighten
    Tighten the screws to 6 N·m (53 lb in).

  5. Install the new O-ring seal. Coat the O-ring seal 525 viscosity refrigerant oil.
  6. Install the auxiliary compressor hose to the auxiliary evaporator.

    7. Tighten
    Tighten the auxiliary compressor hose to 32 N·m (24 lb ft).

  7. Install the new O-ring seal. Coat the O-ring seal with 525 viscosity refrigerant oil.
  8. Install the auxiliary evaporator hose to the auxiliary evaporator.

    9. Tighten
    Tighten the auxiliary evaporator hose to 17 N·m (13 lb ft).

  9. Install the right front wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Front End.
  10. Install the new O-ring seal. Coat the O-ring seal with 525 viscosity refrigerant oil.
  11. Install the refrigerant hose assembly to the auxiliary compressor hose.

    12. Tighten
    Tighten the refrigerant hose assembly to 24 N·m (18 lb ft).

  12. Lower the vehicle.
  13. Install the new O-ring seal. Coat the O-ring seal with 525 viscosity refrigerant oil.
  14. Install the evaporator tube to the auxiliary evaporator hose.

    15. Tighten
    Tighten the evaporator tube to 24 N·m (18 lb ft).

  15. Install the air cleaner assembly.
  16. Charge the system. Refer to Refrigerant Recovery and Recharging .
  17. Inspect the system for leaks. Refer to Leak Testing .