INADEQUATE WINDSHIELD DEFROST PERFORMANCE INSTALL NEW SEAL
SUBJECT: INADEQUATE WINDSHIELD DEFROSTER PERFORMANCE - INSTALL FOAM SEAL/DEFROSTER GRILLE
MODELS/YEARS: 1991 CUSTOM CRUISER
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 12.7mm x 12.7mm (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 12mm (15/32') in height versus 5mm (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 arid screws.
21. Install left hand I.P. trim plate arid screws.
22. Install right hand I.P. molding.
23. Install tilt lever.
24. Install steering column filler panel and screws.
WARRANTY INFORMATION:
Labor Operation Number: T1585 Labor Time: 0.9 hour Trouble Code: 92
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
