GM Cavalier/Sunbird/Skyhawk/Firenza 1982-1994

Heater Core

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REMOVAL & INSTALLATION




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.

1982-87 Vehicles
WITHOUT A/C
  1. Disconnect the negative battery cable.
  2.  
  3. Properly drain the cooling system.
  4.  
  5. Disconnect the heater inlet and outlet hoses from the heater core.
  6.  
  7. Remove the heater outlet deflector.
  8.  
  9. Unfasten the retaining screws, then remove the heater core cover.
  10.  
  11. Detach the heater core retaining straps, then then remove the heater core.
  12.  
  13. Installation is the reverse of removal. Refill the cooling system. Check heater system for proper operation.
  14.  

WITH A/C
  1. Disconnect the negative battery cable and drain the cooling system.
  2.  
  3. Raise and support the front of the vehicle.
  4.  
  5. Disconnect the drain tube from the heater case.
  6.  
  7. Remove the heater hoses from the heater core.
  8.  
  9. Lower the car. Remove the right and left hush panels, the steering column trim cover, the heater outlet duct and the glove box.
  10.  
  11. Remove the heater core cover. Be sure to pull the cover straight to the rear so as not to damage the drain tube.
  12.  
  13. Remove the heater core clamps and then remove the core.
  14.  
  15. Reverse the above procedure to install, and fill the cooling system.
  16.  

1988-94 Vehicles

See Figures 1, 2 and 3

  1. Disconnect the negative battery cable and drain the cooling system.
  2.  
  3. Raise and support the vehicle safely.
  4.  
  5. If equipped, remove the rear lateral transaxle strut mount.
  6.  
  7. Disconnect the drain tube from the heater case.
  8.  
  9. Detach the heater hoses from the heater core.
  10.  
  11. Carefully lower the vehicle.
  12.  
  13. Remove the right and left sound insulators.
  14.  
  15. Unfasten the steering column opening filler. Disconnect the heater outlet deflector (floor air outlet duct).
  16.  



Click image to see an enlarged view

Fig. Fig. 1: Disconnect the floor air outlet duct

  1. Remove the heater core cover.
  2.  



Click image to see an enlarged view

Fig. Fig. 2: Unfasten the retaining bolts, then remove the heater core cover

  1. Detach the heater core retaining straps (clamps), then remove the heater core.
  2.  



Click image to see an enlarged view

Fig. Fig. 3: Detach the retaining clamps or straps, then remove the heater core

To install:
  1. Install the heater core and retaining straps (clamps).
  2.  
  3. Install the heater core cover.
  4.  
  5. Reconnect the heater outlet deflector (floor air outlet duct).
  6.  
  7. Install the right and left sound insulators. Install the steering column opening filler.
  8.  
  9. Raise and support the vehicle safely.
  10.  
  11. Connect the heater hoses (use new heater hose clamps if necessary) to the heater core.
  12.  
  13. Connect the drain tube to heater case.
  14.  
  15. Connect the rear lateral transaxle strut mount, if equipped.
  16.  
  17. Lower the vehicle.
  18.  
  19. Fill the cooling system and check for leaks. Check heater system for proper operation.
  20.  

 
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