ELECT. SYSTEM MANUAL UPDATE A/C (REVISED CHART). Buick LeSabre 1990

VACUUM LINES FROM THE HEATER AND A/C CONTROL ASSEMBLY TO ACTUATORS WERE LABELED WITH INCORRECT COLORS.

VACUUM LINE COLORS SHOWN ON PAGE 377 OF THE ELECTRICAL SYSTEMS MANUAL HAVE BEEN REVISED. THE VACUUM LINE FROM PIN 1 OF THE HEATER AND A/C CONTROL ASSEMBLY TO THE DEFROST-A/C VALVE VACUUM ACTUATOR IS BLUE. THE VACUUM LINE FROM PIN 4 OF THE HEATER AND A/C CONTROL ASSEMBLY TO THE MODE VALVE VACUUM ACTUATOR IS YELLOW. PLEASE UPDATE YOUR 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.