GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Jimmy - 4WD 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Evaporator Tube Replacement

Removal Procedure

    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.

  1. Disconnect the negative battery cable.
  2. Recover the refrigerant from the system.

    3. Refer to Refrigerant Recovery and Recharging .


    Object Number: 3723 Size: SH
  3. Remove the evaporator tube clip screw.
  4. Remove the evaporator tube clip from the accumulator.
  5. Remove the evaporator tube from the evaporator.
  6. Remove the O-ring seal.
  7. Remove the air intake resonator (2.2L only), or the lower radiator hose (4.3L only).

    8. Object Number: 281178 Size: SH
  8. Remove the evaporator tube from the condenser.
  9. Remove the O-ring seal.

Installation Procedure
  1. Install a new O-ring seal.

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


    Object Number: 281178 Size: SH

    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 evaporator tube to the condenser.

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

  3. Install the air intake resonator (2.2L only), or the lower radiator hose (4.3L only).
  4. Install a new O-ring seal.

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


    Object Number: 3723 Size: SH
  5. Install the evaporator tube to the evaporator.

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

  6. Install the evaporator tube clip to the accumulator.
  7. Install the evaporator tube clip screw.

    8. Tighten
    Tighten the screw to 1.9 N·m (17 lb in).

  8. Connect the negative battery cable.
  9. Add refrigerant to the system.
  10. Inspect the system for leaks.