HVAC MODULE WATER LEAK-SEALING PROCEDURE

Models Affected: 1988-90 GRAND PRIX MODELS WITH ALL ENGINES

Some of the above vehicles have been reported as having water leaking from the HVAC module. This water leak is coming from the lower front side of the module, as shown in Figure 1.

This water leak causes the front carpet to be wet and the resultant musty odor that is being mistakenly diagnosed as A/C odor.

This water leak condition may be addressed by either one of the following service parts and procedures.

Quantity Part Number Part Name -------- ----------- ---------- 1 1052915 Silicone Sealant RTV 1 08670 - 3oz. Tube **High Temp Gasket Sealant

Part is currently available from GMSPO.

** Purchase locally

Procedure:

1. Raise vehicle and remove the A/C module rubber drain tube and lower the vehicle.

2. Remove the close out panels (hush panels).

IMPORTANT: Steps 3 and 4 apply only to the Pontiac with full sound system radio.

3. Remove the ash tray and retainer.

4. Remove the radio sound amplifier and bracket.

5. Pull back the carpet and remove the adapter duct (2 screws).

6. Remove the heater outlet duct (3 screws).

7. Remove the A/C module lower cover (7 screws).

8. Fill the front groove of the module, in the area indicated in Figure 1, with the specified sealant from the indicated area out to the screw attachment on each side of the area.

9. Reinstall the bottom module cover.

10. Reinstall the front heater outlet duct.

11. Reinstall the adapter duct and replace the carpet.

IMPORTANT: Steps 12 and 13 apply only to the vehicles with the full sound radio system.

12. Reinstall the radio amplifier and bracket.

13. Reinstall the ash tray and retainer.

14. Reinstall the close out panels (hush panels).

15. Raise the vehicle and reinstall the A/C module drain tube.

Labor Operation Number: T1545

Labor Time 0.7 Hours without full sound system radio

0.8 Hours with the Full sound system radio

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.