INTERMITTENT A/C OPERATION OR BLOWN #7 FUSE

VEHICLES AFFECTED: 1989 C AND H CARLINES

Pull to seat connectors are now used at the A/C compressor clutch location on 1989 C and H models. Because of this change, the compressor clutch diode has been relocated about 14 inches away and into the wire harness. Under certain conditions, the diode legs can short to the harness and cause a condition of intermittment A/C operation or blows the A/C fuse located in the number 7 position of the fuse panel.

Diagnosis of this condition will require the removal of the generator to access the diode in its new location. The diode should be inspected after removal of the heat shrink material protecting it. Generally, a properly operating diode can be reinsulated and returned to the harness conduit to repair this intermittent condition. Inoperative diodes should be replaced using a 1 amp, 400 volt common clamping diode.

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.