GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Seville 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 HVAC Module Assembly Replacement

Removal Procedure

Tools Required

    • J 39500-B A/C Refrigerant Recovery, Recycling and Recharging System
    • J37097-A Hose Clamp Remover/Installer

    Object Number: 130636 Size: SH
  1. Disable the SIR system. Refer to Disabling the SIR System in SIR.
  2. Recover the refrigerant from the system. Refer to Refrigerant Recovery and Recharging .
  3. Disconnect the evaporator hose assembly from the evaporator core.
  4. Remove the heater hoses from heater core. Refer to Heater Hoses Replacement .
  5. Remove the instrument panel assembly. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gauges and Console.

    6. Object Number: 130710 Size: SH
  6. Remove the evaporator drain.

    7. Object Number: 130668 Size: SH
  7. Remove the defroster nozzle.

    8. Object Number: 284240 Size: SH
  8. Remove the heater duct.

    9. Object Number: 130657 Size: SH
  9. Remove the heater and evaporator module retaining nuts.
  10. Remove the heater and evaporator module assembly.

Installation Procedure

    Object Number: 130657 Size: SH
  1. Install the heater and evaporator module assembly.

    2. 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 heater and evaporator module retaining nuts.

    3. Tighten
    Tighten the heater and A/C module retaining nuts to 13 N·m (10 lb ft).


    Object Number: 284240 Size: SH
  3. Install the heater duct.

    4. Object Number: 130668 Size: SH
  4. Install the defroster nozzle.

    5. Object Number: 130710 Size: SH
  5. Install the evaporator drain.
  6. Install the instrument panel assembly. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gauges and Console.
  7. Install the heater hoses to the heater core. Refer to Heater Hoses Replacement .
  8. Connect the evaporator hose assembly to the evaporator core.

    9. Tighten
    Tighten the evaporator hose assembly to 20 N·m (15 lb ft).

  9. Recharge the refrigerant system. Refer to Refrigerant Recovery and Recharging .
  10. Enable the SIR system. Refer to Enabling the SIR System in SIR.