Drive Belt Noise, Service Engine Soon/Generator Light Illuminated, Engine Will Not Start or Quits Running (Replace Generator and Reseal Windshield Water Runoff Duct)

This bulletin is being revised to add model years and add a step to the Correction procedure. Please discard Corporate Bulletin Number 01-06-03-010 (Section 06 - Engine/Propulsion System).

Some customers may comment on one or more of the following conditions:

This condition is most prevalent at outside temperatures below 0°C (32°F).

The plastic windshield water runoff duct may not be properly sealed or fastened to the cowl located directly above the generator. This can lead to runoff water from the windshield being directed onto the generator. During times of freezing temperatures, the ingested water can become frozen inside the generator, resulting in generator damage.

Replace the generator and reseal the windshield water runoff duct mating surface to the cowl and fastening it onto the studs in the cowl, ensuring that it is properly sealed at the three studs. Use the procedure and part numbers listed below.

1. Remove the generator. Refer to the Generator Replacement procedure in the Engine Electrical sub-section of the Service Manual.
2. Inspect and replace the drive belt, if necessary.



3. Remove the nuts retaining the runoff duct (1) to the cowl.
4. Lower the runoff duct and apply sealer, P/N 12345097 (Canadian P/N 10953479), or equivalent.
5. Install the runoff duct and nuts.
6. Install the new generator. Refer to the Generator Replacement procedure in the Engine Electrical sub-section of the Service Manual.

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: