MANUAL CLIMATE CONTROL A/C CLUTCH INOP.(NEW P/N RELEASED)

SUBJECT: MANUAL CLIMATE CONTROL A/C CLUTCH INOPERATIVE (INSTALL NEW CONTROL HEAD AND NEW SOLENOID PACK)

VEHICLES AFFECTED: 1991 BUICK PARK AVENUE

CONDITION:

Customers of 1991 Park Avenues built with "C67" (Manual Climate Control) may comment that the windshield sometimes fogs up after the defrost or defog mode is selected.

CAUSE:

The cause of this condition is an error in the logic of the control head. The head is programmed to only request A/C clutch when A/C is selected.

CORRECTION:

To correct the above condition, a new control head has been designed to request clutch operation in defrost and defog. This control head is matched with the solenoid pack and will require that a new solenoid pack be installed with the new control head.

PARTS INFORMATION: SOLENOID PACK #16166674 HEAD W/REAR DEFOGGER #16145214 HEAD WITHOUT REAR DEFOGGER #16145204

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.