For 1990-2009 cars

# SERVICE MANUAL UPDATE-SEC. 1C AUTO A/C DISPLAY CONTROL TEST

#### SUBJECT: AUTOMATIC AIR CONDITIONING (C68): DISPLAY ILLUMINATION CONTROL TEST - REVISED DIAGNOSTIC PROCEDURE

#### MODEL/YEARS: 1993 EIGHTY EIGHT AND NINETY EIGHT

The DISPLAY ILLUMINATION CONTROL TEST found in the 1993 Eighty Eight and Ninety Eight Service Manuals has been revised to avoid confusion and misdiagnosis of the automatic A/C system.

The following revised chart should be used for proper system diagnosis:

1993 Oldsmobile Eighty-Eight/Ninety-Eight Service Manual, page 1C-45.

Please update your respective service manual accordingly.

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.