SMU - SECTION 8A - 63 HEATER AND A/C CONTROLS. GMC Truck GMC C Pickup

SUBJECT: SERVICE MANUAL UPDATE - SECTION 8A-63 - HEATER AND A/C CONTROLS

MODELS: 1994 CHEVROLET AND GMC TRUCK C/K MODELS WITH AIR CONDITIONING

THE FOLLOWING REPRESENTS REVISED INFORMATION FOR SECTION 8A-63 OF THE 1994 C/K MODELS DRIVEABILITY, EMISSIONS, AND ELECTRICAL DIAGNOSIS MANUAL (NATP-9442).

THIS INFORMATION UPDATES INFORMATION FOUND ON PAGES 8A-63-9 AND 8A-63-10 UNDER HEATER AND A/C CONTROLS.

TEST F AND TEST G INCORRECTLY CALLS FOR THE TECHNICIAN TO USE AN A/C DIAGNOSTIC TESTER WHILE DIAGNOSING AIR CONDITIONING AIR DELIVERY MODES.

THE DIAGNOSTIC TESTER IS NOT CURRENTLY AVAILABLE. WHEN IT IS REFERENCED DURING TESTING, BACKPROBE THE PROPER CAVITY OF THE CONNECTOR. FOLLOW GM GUIDELINES AS DESCRIBED IN 8A-2.

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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.