GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Corvette 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Evaporator and Accumulator Hose Assembly

Removal Procedure

    Object Number: 297279 Size: SH
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .

    2. 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.

  2. Disconnect the negative battery cable.
  3. Remove the battery. Refer to Battery Replacement in Engine Electrical.
  4. Remove the battery heat shield. Refer to Battery Heat Shield Replacement in Body Front End.
  5. Remove the engine intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical.
  6. Remove the nut retaining the heater pipe bracket to the dash panel.
  7. Reposition the heater pipe bracket to access the refrigerant lines.

    8. Object Number: 297295 Size: SH
  8. Remove the evaporator tube - front to evaporator tube - rear retaining bolt.

    9. Important: Cap or tape the open evaporator tube - front and the evaporator tube - rear immediately.

  9. Disconnect the evaporator tube - front from the evaporator tube - rear, discard the O-ring seal and cap or tape the evaporator tubes to prevent contamination.

    10. Object Number: 95632 Size: SH
  10. Remove the compressor hose to accumulator retaining bolt.

    11. Important: Cap or tape the open compressor hose and the accumulator immediately.

  11. Disconnect the compressor hose from the accumulator, discard the O-ring seal and cap or tape the compressor hose and the accumulator to prevent contamination.
  12. Reposition the compressor hose end.

    13. Object Number: 297276 Size: SH
  13. Remove the accumulator hose to evaporator retaining bolt.

    14. Important: Cap or tape the open accumulator hose, evaporator tube - rear and the evaporator immediately.

  14. Disconnect the accumulator hose and the evaporator tube - rear from the evaporator, discard the O-ring seals and cap or tape the hose end, the tube end and the evaporator to prevent contamination.

    15. Object Number: 297298 Size: SH
  15. Remove the accumulator bracket mounting nuts.
  16. Reposition the accumulator to access the accumulator hose to accumulator fitting.

    17. Object Number: 297225 Size: SH

    Important: Prior to removal, take note of the accumulator hose orientation to the accumulator and the evaporator tube - rear.

  17. Using a back-up wrench on the accumulator fitting (2), loosen the accumulator hose fitting (1) from the accumulator.

    18. Object Number: 297300 Size: SH

    Important: Cap or tape the open accumulator hose and the accumulator immediately.

  18. Disconnect the accumulator hose from the accumulator, discard the O-ring seal and cap or tape the accumulator hose and the accumulator to prevent contamination.

    19. Object Number: 297282 Size: SH
  19. Remove the accumulator hose and evaporator tube - rear from the vehicle.
  20. Separate the accumulator hose from the evaporator tube - rear.

Installation Procedure

    Object Number: 297282 Size: SH
  1. Position the accumulator hose to the evaporator tube - rear.
  2. Install the accumulator hose and evaporator tube - rear to the vehicle.

    3. Object Number: 297232 Size: SH
  3. Remove the cap or tape from the accumulator hose and the accumulator.
  4. Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the accumulator hose and the accumulator.
  5. Lightly coat the new O-ring seal (1) with mineral base 525 viscosity refrigerant oil.

    6. Important: DO NOT allow any of the mineral base 525 viscosity refrigerant oil on the O-ring seal to enter the refrigerant system.

  6. Carefully slide the new O-ring seal (1) onto the accumulator hose until seated.

    7. Object Number: 297300 Size: SH
  7. Install the accumulator hose to the accumulator.
  8. Orientate the accumulator hose to the accumulator and the evaporator tube - rear as noted prior to removal.

    9. Object Number: 297225 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.

  9. Using a back-up wrench on the accumulator fitting (2), secure the accumulator hose fitting (1) to the accumulator.

    10. Tighten
    Tighten the accumulator hose fitting to the accumulator to 41 N·m (30 lb ft).


    Object Number: 297298 Size: SH
  10. Install the accumulator and bracket into position.
  11. Install the accumulator bracket mounting nuts.

    12. Tighten
    Tighten the accumulator bracket mounting nuts to 10 N·m (89 lb in).


    Object Number: 297232 Size: SH
  12. Remove the cap or tape from the accumulator hose, evaporator tube - rear and the evaporator.
  13. Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the accumulator hose, evaporator tube - rear and the evaporator.
  14. Lightly coat the new O-ring seals (1) with mineral base 525 viscosity refrigerant oil.

    15. Important: DO NOT allow any of the mineral base 525 viscosity refrigerant oil on the O-ring seals to enter the refrigerant system.

  15. Carefully slide the new O-ring seals (1) onto the accumulator hose and the evaporator tube - rear until seated.

    16. Object Number: 297276 Size: SH
  16. Install the accumulator hose and evaporator tube - rear to the evaporator.
  17. Install the accumulator hose to evaporator retaining bolt.

    18. Tighten
    Tighten the accumulator hose to evaporator retaining bolt to 16 N·m (12 lb ft).


    Object Number: 297228 Size: SH
  18. Remove the cap or tape from the evaporator tube - front and the evaporator tube - rear.
  19. Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the evaporator tube - front and the evaporator tube - rear.
  20. Lightly coat the O-ring seal (1) with mineral base 525 viscosity refrigerant oil.

    21. Important: DO NOT allow any of the mineral base 525 viscosity refrigerant oil on the O-ring seal to enter the refrigerant system.

  21. Carefully slide the new O-ring seal (1) onto the evaporator tube - front until seated.

    22. Leave a light coating of the refrigerant oil to remain on the evaporator tube - front in the area indicated (2) ONLY.


    Object Number: 297295 Size: SH
  22. Install the evaporator tube - front to the evaporator tube - rear.
  23. Install the evaporator tube - front to evaporator tube - rear retaining bolt.

    24. Tighten
    Tighten the evaporator tube - front to evaporator tube - rear retaining bolt to 27 N·m (20 lb ft).


    Object Number: 297228 Size: SH
  24. Remove the cap or tape from the compressor hose and the accumulator.
  25. Using a lint-free clean, dry cloth, carefully clean the sealing surfaces of the compressor hose and the accumulator.
  26. Lightly coat the O-ring seal (1) with mineral base 525 viscosity refrigerant oil.

    27. Important: DO NOT allow any of the mineral base 525 viscosity refrigerant oil on the O-ring seal to enter the refrigerant system.

  27. Carefully slide the new O-ring seal (1) onto the compressor hose until seated.

    28. Leave a light coating of the refrigerant oil to remain on the compressor hose in the area indicated (2) ONLY.


    Object Number: 95632 Size: SH
  28. Install the compressor hose to the accumulator.
  29. Install the compressor hose to accumulator retaining bolt.

    30. Tighten
    Tighten the compressor hose to accumulator retaining bolt to 20 N·m (15 lb ft).


    Object Number: 297279 Size: SH
  30. Install the heater pipe bracket to the dash panel stud.
  31. Install the heater pipe bracket retaining nut.

    32. Tighten
    Tighten the heater pipe bracket retaining nut to 10 N·m  (89 lb in).

  32. Install the engine intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical.
  33. Install the battery heat shield. Refer to Battery Heat Shield Replacement in Body Front End.
  34. Install the battery. Refer to Battery Replacement in Engine Electrical.
  35. Connect the negative battery cable.

    36. Tighten
    Tighten the negative battery cable bolt to 15 N·m (11 lb ft).

  36. Program the transmitters. Refer to Transmitter Programming/Synchronization in Keyless Entry.
  37. Evacuate and charge the refrigerant system. Refer to Refrigerant Recovery and Recharging .
  38. Check the compressor hose to accumulator, accumulator hose and evaporator tube - rear joints for leaks. Refer to Leak Testing .