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Bill, Chevy Technician
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Experience:  GM Certified Master Technician
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1998 Grand Prix: Directions for heater core replacement

Resolved Question:

1998 Grand Prix. Directions for heater core replacement? Do I need to remove the dash?
Submitted: 3 years ago.
Category: Chevy
Expert:  Bill replied 3 years ago.
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Service Information
Document ID: 514005

Heater Core Replacement

Removal Procedure

  1. Remove the air cleaner and duct assembly (3.1L only). Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.1L.
  2. Remove the fuel injector sight shield (3.8L only). Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 3.8L or Fuel Injector Sight Shield Replacement in Engine Mechanical - 3.8L.
  3. Drain the coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  4. Disconnect both of the heater hoses at the heater core. Refer to Heater Hoses Replacement (3.8L) or Heater Hoses Replacement (3.1L) .
  5. Remove the lower the floor console if equipped. Refer to Front Floor Console Replacement in Instrument Panel, Gauges and Console.
  6. Remove the RH and LH instrument panel insulators. Refer to Instrument Panel Insulator Replacement in Instrument Panel, Gauges and Console.

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  7. Remove the heater core outlet cover screws.
  8. Remove the heater core outlet cover.

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  9. Remove the heater core cover screws.
  10. Remove the heater core cover.

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  11. Remove and discard the seals (1,2,3) from the heater core cover.

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  12. Remove and discard the heater core outer seal (5) from the heater core.

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  13. Remove the heater core clamp screw (1).
  14. Remove the heater core retaining clamp.
  15. Remove the heater core pipe retainer clamp screw (2).

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  16. Remove the heater core from the HVAC lower case.

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  17. Remove and discard the heater core lower seal (4) from the HVAC case.

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  18. Remove and discard the heater core center seal (3) from the HVAC case.

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  19. Remove and discard the heater core upper seal (2) from the HVAC lower case.

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  20. Remove and discard the heater core side seals (1) from the HVAC lower case.

Installation Procedure


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  1. Install the heater core side seals (1) from the HVAC lower case.

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  2. Install the heater core upper seal (2) from the HVAC lower case.

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  3. Install the heater core center seal (3) from the HVAC case.

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  4. Install the heater core lower seal (4) from the HVAC case.

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  5. Install the heater core from the HVAC lower case.

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    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.

  6. Install the heater core line clamp screw (2).

    Tighten
    Tighten the heater core line clamp screw to 1.5 N·m (13 lb in).

  7. Install the heater core mounting clip with a screw (1).

    Tighten
    Tighten the heater core mounting clip screw to 1.5 N·m (13 lb in)


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  8. Install heater core outer seal (5) to the heater core.

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  9. Install new seals (1,2,3) to the heater core cover.

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  10. Install the heater core cover.
  11. Install the heater core cover screws.

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


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  12. Install the heater core outlet cover.
  13. Install the heater core outlet cover screws.

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

  14. Install the lower the floor console if equipped . Refer to Front Floor Console Replacement in Instrument Panel, Gauges and Console.
  15. Install the RH and LH instrument panel insulators. Refer to Instrument Panel Insulator Replacement in Instrument Panel, Gauges and Console.
  16. Connect both of the heater hoses at the heater core. Refer to Heater Hoses Replacement (3.8L) or Heater Hoses Replacement (3.1L) .

     

  17. Refill the coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  18. Install the air cleaner and duct assembly (3.1L only). Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.1L.
  19. Install the fuel injector sight shield (3.8L only). Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 3.8L or Fuel Injector Sight Shield Replacement in Engine Mechanical - 3.8L.

© 2010 General Motors. All rights reserved.

 

 

Expert:  Bill replied 3 years ago.

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Customer: replied 3 years ago.
The pics did not come through but from the text it looks like this is very similar to the 2001 monte carlo I just finished. No dash removal required, right?
Expert:  Bill replied 3 years ago.

Correct. I added a few pictures at the end. My apologies as I'm having an issue with the pictures not uploading with the text. The 2001 monte carlo is also a W body and the procedure is almost exactly the same other than a different console arrangement.

Cheers!

 

Bill

Bill, Chevy Technician
Category: Chevy
Satisfied Customers: 1610
Experience: GM Certified Master Technician
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