TEMP ON HVAC SYSTEM CHANGES BY ITSELF (HVAC. Buick Park Avenue 1997

THIS IS A MONTHLY SERVICE NEWSLETTER ARTICLE. THIS IS NOT INTENDED TO BE A PUBLISHED BULLETIN

SUBJECT: TEMPERATURE ON HVAC SYSTEM CHANGES BY ITSELF (HVAC PROGRAMMER IS RESETTING)

MODELS: 1997 BUICK PARK AVENUE/ULTRA

CONDITION:

THE TEMPERATURE DISPLAY ON THE HVAC CONTROL HEAD DISPLAY CHANGES BY ITSELF WHILE DRIVING AND COMES BACK ON AT 75 DEGREES. THE BLOWER MOTOR MAY ALSO GO OFF FOR ABOUT 1 MINUTE.

CAUSE:

THE HVAC PROGRAMMER IS DOING AN INTERNAL RESET.

CORRECTION:

THE REPAIR IS TO REPLACE THE HEATER CONTROL MODULE/PROGRAMMER WITH A 1998 MODULE. THERE MAY BE A KEEP ALIVE MEMORY (KAM) RESET CODE IN THE HEATER CONTROL MODULE TO CONFIRM THE CONDITION.

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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.