GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Heater/AC Ducts and Outlets

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REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4

Heater Duct

The heater duct can be removed by removing the retaining screw at the top center of the duct and working it free of the cutout base in the heater module case. Installation is the reverse of removal.

Instrument Panel Outlet Duct
  1. Remove the instrument panel.
  2.  
  3. Remove the duct attaching screws at the upper shroud mounting flange of the dash panel.
  4.  
  5. Remove the duct attaching screw at the heater module.
  6.  
  7. Installation is the reverse of removal.
  8.  



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Fig. Fig. 1: 1975 and 1976 instrument panel outlet ducts



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Fig. Fig. 2: 1977 to 1990 instrument panel outlet ducts

Defroster Nozzle
  1. Remove the instrument panel and the instrument panel outlet duct.
  2.  
  3. Remove the defroster attaching screws near the base of the windshield.
  4.  
  5. Remove the attaching screw at the top of the heater module.
  6.  
  7. Remove the defroster module.
  8.  
  9. Installation is the reverse of removal.
  10.  



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Fig. Fig. 3: 1975 and 1976 defroster nozzle assembly



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Fig. Fig. 4: 1977 to 1990 defroster nozzle assembly

 
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