SERVICE MANUAL UPDATE-SEC. 1B NEW CHART A FOR C.C.O.T. DIAG.

Models Affected: 1988-89-90 BONNEVILLE MODELS W/3800 ENGINE (VIN C)

The information given in "Chart A" of the C.C.O.T. System Air Conditioning Diagnosis on Insufficient Cooling is incomplete in Section 1B of the 1988, 1989 and 1990 Bonneville service manuals. Please use the new chart on the reverse side of this bulletin to revise chart on page 1B-7 in the involved service manuals.

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.