GM Celebrity/Century/Ciera/6000 1982-1996 Repair Guide

Heater Core

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REMOVAL & INSTALLATION



Air Conditioned Models

See Figures 1, 2, 3 and 4


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Disconnect the negative battery cable and drain the cooling system.
  2.  
  3. Disconnect the heater hoses from the heater core inlet and outlet connections in the engine compartment.
  4.  
  5. Allowing residual coolant from the heater core to drain. Cap the openings.
  6.  
  7. Working inside the vehicle, remove the lower instrument panel sound insulator.
  8.  
  9. Remove the heater floor outlet duct screws or clips and remove the duct.
  10.  



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Fig. Fig. 1: Remove the heater floor outlet duct screws or clips ...



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Fig. Fig. 2: ... then remove the heater floor outlet duct

  1. Remove the heater core cover by removing the attaching screws and clips.
  2.  
  3. Remove the heater core cover.
  4.  
  5. Remove the heater core retainers and remove the heater core.
  6.  



Click image to see an enlarged view

Fig. Fig. 3: Remove the mounting bolts which retain the heater core

To install:
  1. Position the heater core in the housing and install the retaining straps.
  2.  
  3. Position the heater core cover on the housing and install the attaching screws and clips.
  4.  
  5. Install the floor outlet duct and attaching screws or clips.
  6.  



Click image to see an enlarged view

Fig. Fig. 4: Exploded view of the heater core and case assembly

  1. Install the lower instrument panel sound insulator.
  2.  
  3. Working in the engine compartment, connect the heater core inlet and outlet hoses.
  4.  
  5. Fill the cooling system.
  6.  
  7. Start the engine and check for coolant leaks. Allow the engine to warm up sufficiently to confirm the proper operation of the heater.
  8.  
  9. Recheck for leaks. Check the cooling system level.
  10.  

Air Conditioned Models

See Figure 5

  1. Drain the cooling system.
  2.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. If equipped with a diesel engine, raise and support the car on jackstands.
  2.  
  3. Disconnect the hoses at the core.
  4.  
  5. On diesels, remove the instrument panel lower sound absorber.
  6.  



Click image to see an enlarged view

Fig. Fig. 5: Heater and air conditioning module assembly

  1. Remove the heater duct and lower side covers.
  2.  
  3. Remove the lower heater outlet.
  4.  
  5. Remove the two housing cover-to-air valve housing clips.
  6.  
  7. Remove the housing cover.
  8.  
  9. Remove the core restraining straps.
  10.  
  11. Remove the core tubing retainers and lift out the core.
  12.  

To install:
  1. Install the core, then attach the core tubing retainers.
  2.  
  3. Attach the core restraining straps.
  4.  
  5. Install the housing cover, then install the two housing cover-to-air valve housing clips.
  6.  
  7. Install the lower heater outlet, then attach the heater duct and lower side covers.
  8.  
  9. On diesels, install the lower instrument panel sound absorber.
  10.  
  11. Connect the hoses at the core.
  12.  
  13. Lower the vehicle if raised and supported.
  14.  
  15. Fill the cooling system.
  16.  
  17. Start the engine and check for coolant leaks. Allow the engine to warm up sufficiently to confirm the proper operation of the heater.
  18.  
  19. Recheck for leaks. Check the cooling system level.
  20.  

 
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