Windshield Defroster - Inadequate Performance

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NUMBER: 91-T-162A

CORP.REF.NO: 031211, 131207

DATE: February 1992

SECTION: 1B


SUBJECT:
INADEQUATE WINDSHIELD DEFROSTER PERFORMANCE - INSTALL FOAM SEAL/DEFROSTER GRILLE


MODELS/YEARS:
1991 CUSTOM CRUISE


This bulletin cancels and replaces Dealer Technical Bulletin 91-T-162, which should be discarded.

CONDITION: Inadequate windshield defroster performance.

CAUSE: Inadequate air flow to the base of the windshield caused by a loss of defroster air at a gap between the heater-A/C module and the distribution defroster nozzle and/or by the distribution of defroster air by the defroster grille itself.

IMPROVEMENT: Using the procedure below add a strip of foam seal 12.7 mm x 12.7 mm (1/2" X 1/2") around the lower surface perimeter of the distributor defroster nozzle and, if necessary, install a new defroster grille.

1. Remove steering column filler panel and screws.
2. Remove tilt lever.
3. Remove right hand I.P. molding.
4. Remove left hand I.P. trim plate.
5. Remove the upper I.P. trim pad and screws.
6. Remove the right hand sound insulator panel and screws.
7. Disconnect the temperature cable from the heater-A/C module (C60).
8. Remove the I.P. carrier screws (7) and pull back the carrier.
9. Disconnect the main I.P. wire harness clip at the center front area of the air distributor duct for clearance to remove the defroster nozzle.
10. Remove the defroster nozzle screws (2), as shown in the illustration on the back of this bulletin.
11. Remove the defroster nozzle with an upward rearward motion.





12. Install the foam seal (P/N 3963794 currently available from GMSPO) around the perimeter on surface "A" of the defroster nozzle, as shown in the illustration.
13. Install the defroster nozzle.

Important: Make sure the mounting tab on the bottom front edge of the defroster nozzle is located in the mounting clip on the front of the dash panel, as shown in the illustration.
14. Install the (2) defroster nozzle screws.
15. Inspect the defroster grille for the revised design.

The revised grille may be identified by the vertical vanes measuring 12 mm (15/32) in height versus 5 mm (9/32") on the older grille. Following is a list of the revised defroster grille assembly part numbers by usage and color.

Part Numbers Color
With C60 With C68
17990142 17990145 Dark Camel
17990143 17990146 Dark Maple Red
17990144 17990147 V/Dark Sapphire

16. Clip the I.P. wire harness to the air distributor.
17. Position I.P. carrier and install screws (7).
18. Connect temperature cable to the heater-A/C module (C60).
19. Install right hand sound insulator panel and screws.


20. Install upper I.P. trim pad and screws.
21. Install left hand I.P. trim plate and screws.
22. Install right hand I.P. molding.
23. Install tilt lever.
24. Install steeRing column filler and screws.

WARRANTY INFORMATION:
Labor Operation Number
TI585
Labor Time:
0.9 hour
Trouble Code:
92