For 1990-2009 cars

# SERVICE MANUAL UPDATE-SEC.1B A/C V-DOT DIAGNOSIS CHARTS

#### VEHICLES AFFECTED: 1989 J AND M, 1990 W,A,J,L AND N CARS U APV VANS

THIS BULLETIN HAS BEEN REVISED TO CORRECT FIGURE 3 AND FIGURE 7 IN THE DIAGNOSIS CHARTS.

The V-DOT (Variable Displacement Orifice Tube) diagnosis charts have been revised. The following charts should be used when diagnosing the V-DOT System for the following Service Manuals.

#### Models Affected:

1990 Chevrolet Lumina Section 1B Pages 1B-9 Thru 1B-11

1990 Pontiac Grand Prix Section 1B Pages 1B-9 Thru 1B-15 1990 Oldsmobile Cutlass Supreme Section 1B Pages 1B-9 Thru 1B-15 1990 Buick Regal Section 1B Pages 1B-9 Thru 1B-15

1990 Chevrolet/Pontiac A Car Section 1B2 Pg. 1B2-8 Thru 1B2-14 1990 Oldsmobile Ciera Section 1B2 Pg. 1B2-8 Thru 1B2-14 1990 Buick Century Section 1B2 Pa. 1B2-8 Thru 1B2-14

1990 Chevrolet Lumina APV Section 1B Pages 1B-17 Thru 1B-24 1990 Pontiac Trans Sport Section 1B Pages 1B-17 Thru 1B-24 1990 Oldsmobile Silhouette Section 1B Pages 1B-17 Thru 1B-24

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.