GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Lumina 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Heater Core Replacement

Removal Procedure
  1. Drain the coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Disconnect both of the heater hoses at the heater core. Refer to Heater Hoses Replacement .
  3. Remove the LH and RH instrument panel insulators. Refer to Instrument Panel Insulator Replacement or Instrument Panel Insulator Replacement in Instrument Panel, Gauges, and Console.
  4. Remove the knee bolster bracket. Refer to Knee Bolster Bracket Replacement in Instrument Panel, Gauges, and Console.
  5. Remove the instrument panel compartment. Refer to Instrument Panel Compartment Replacement in Instrument Panel, Gauges, and Console

    6. Object Number: 416769 Size: SH
  6. Remove the lower heater duct bolts.
  7. Remove the lower heater duct.

    8. Object Number: 416774 Size: SH
  8. Remove the heater core cover bolts.
  9. Remove the heater core cover.

    10. Object Number: 416777 Size: SH
  10. Remove the heater core tube strap bolts.
  11. Remove the heater core bolt and bracket.
  12. Remove the heater core.

Installation Procedure

    Object Number: 416777 Size: SH
  1. Install the heater core.
  2. Install the bracket and straps to the heater core:

    3. 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.

  3. Install the heater core bolts.

    4. Tighten
    Tighten the heater core bracket/strap bolts to 1.5 N·m (13 lb in).


    Object Number: 416774 Size: SH
  4. Install the heater core cover.
  5. Install the heater core cover bolts.

    6. Tighten
    Tighten the heater core cover bolts to 1.5 N·m (13 lb in).


    Object Number: 416769 Size: SH
  6. Install the lower heat duct.
  7. Install the lower heat duct bolts.

    8. Tighten
    Tighten the lower heat duct bolts to 1.5 N·m (13 lb in).

  8. Install the instrument panel compartment. Refer to Instrument Panel Compartment Replacement in Instrument Panel, Gauges, and Console
  9. Install the knee bolster bracket. Refer to Knee Bolster Bracket Replacement in Instrument Panel, Gauges, and Console.
  10. Install the LH and RH instrument panel insulators. Refer to Instrument Panel Insulator Replacement or Instrument Panel Insulator Replacement in Instrument Panel, Gauges, and Console.
  11. Connect both of the heater hoses at the heater core. Refer to Heater Hoses Replacement .
  12. Refill the cooling system. Refer Cooling System Draining and Filling in to Engine Cooling.