GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC Suburban - 2WD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Air Conditioning (A/C) Hose Replacement - Auxiliary

Removal Procedure
  1. Recover the refrigerant. Refer toRefrigerant Recovery and Recharging .
  2. Remove the air cleaner assembly.
  3. Disconnect the evaporator tube (1) from the auxiliary evaporator hose (3).
  4. Remove the O-ring seal (2).
  5. Disconnect the refrigerant hose assembly (6) from the auxiliary compressor hose (4).
  6. Remove the O-ring seal (5).
  7. Remove the right front wheelhouse. Refer to Rear Wheel Opening Flare Replacement in Exterior Trim.
  8. Disconnect the auxiliary evaporator hose (4) from the auxiliary evaporator (1).
  9. Remove the O-ring seal (2).
  10. Disconnect the auxiliary compressor hose (3) from the auxiliary evaporator.
  11. Remove the screws (4).
  12. Remove the hose clips (1).
  13. Remove the auxiliary evaporator hose (1).
  14. Remove the compressor hose (2).

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

    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 (4).

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

  5. Coat the new O-ring seal (2) for the auxiliary compressor hose (3) with 525 viscosity refrigerant oil.
  6. Install the new O-ring seal.
  7. Connect the auxiliary compressor hose to the auxiliary evaporator (1).

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

  8. Coat the new O-ring seal (2) for the auxiliary evaporator hose (4) with 525 viscosity refrigerant oil.
  9. Install the new O-ring seal.
  10. Connect the auxiliary evaporator hose to the auxiliary evaporator.

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

  11. Install the right front wheelhouse. Refer to Rear Wheel Opening Flare Replacement .
  12. Coat the new O-ring seal (5) for the auxiliary compressor hose (4) with 525 viscosity refrigerant oil.
  13. Install the new O-ring seal.
  14. Connect the refrigerant hose assembly (6) to the auxiliary compressor hose.

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

  15. Lower the vehicle.
  16. Coat the new O-ring seal (2) for the auxiliary evaporator hose (3) with 525 viscosity refrigerant oil.
  17. Install the new O-ring seal.
  18. Connect the auxiliary evaporator tube (1) to the auxiliary evaporator hose.

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

  19. Install the air cleaner assembly.
  20. Charge the system. Refer toRefrigerant Recovery and Recharging .
  21. Inspect the system for leaks. Refer to Leak Testing .