HIGH BLOWER OPERATES WITH IGNITION KEY OFF

Model and Year: 1982-88 CAVALIER

Some 1982-88 Cavaliers may experience high blower operation with key off. This condition may be caused by a back feed voltage induced on circuit 50, which powers the "blower off". This back feed voltage could be due to a failed diode in the generator rectifier bridge.

To verify that the blower is being commanded on by this type of back feed, disconnect circuit 25 (on 1982-86 vehicles) or circuit 250 (on 1987-88 vehicles), the brown field wire, from the generator. If all unwanted blower operation discontinues with the ignition key off, for vehicles with serviceable generators, remove the generator and test the rectifier bridge as outlined in section 6D of the Cavalier Service Information Manual under Generator Disassembly, Test, and Reassembly. For vehicles with non-serviceable generators, replace the generator.

For warranty purposes on vehicles with non-serviceable generators, use Labor Operation J4100 at .4 hour to replace the generator. On vehicles with serviceable generators, use Labor Operation J4080 at .8 hour for vehicles with four cylinder engines and .7 hours for vehicles with six cylinder engines to replace the rectifier bridge.

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.