SERVICE GUILD: UPDATE-SEC. 5 DESCRIPTION OF PROPORTIONER

VEHICLES AFFECTED: 1989-90 A-CARS

This change should be made in the following Service Manuals:

1989 Buick Century Section 5 - page 1 1990 Buick Century Section 5 - page 2

1989 Oldsmobile Cutlass Ciera Section 5 page 1 1990 Oldsmobile Cutlass Ciera Section 5 page 2

1989 Pontiac 6000 Section 5 - page 1

1989 Chevrolet Celebrity Section 5 - page 1 1990 Chevrolet Celebrity/Pontiac 6000 Section 5 - page 2

(Except 1989 Pontiac 6000)

The second paragraph under "Operation of Proportioner Valves" should be deleted. This paragraph pertains to a front/rear split system and not the diagonal split system used on this vehicle.

(1989 Pontiac 6000 Only)

The third paragraph under "Operation of Proportioner Valves" should be deleted. This paragraph pertains to a front/rear split system and not the diagonal split system used on this vehicle.

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.