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

VEHICLES AFFECTED: 1988-89-90 C-H CARS W/3800 ENGINE

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 C-H service manuals.

Please use the new chart on the reverse side of this bulletin to revise the 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.