HVAC WHISTLE NOISE USUALLY AT HIGH BLOWER SPEEDS. GMC Truck GMC C Pickup

SUBJECT: HVAC WHISTLE NOISE USUALLY AT HIGH BLOWER MOTOR SPEEDS (SEAL BLOWER MOTOR RESISTOR)

MODELS: 1994 CHEVROLET AND GMC C/K TRUCKS AND 5H, 6H, AND 7H TOPKICK/KODIAK MODELS

CONDITION:

SOME VEHICLES MAY EXHIBIT A WHISTLE NOISE USUALLY AT HIGHER BLOWER MOTOR SPEEDS.

CAUSE:

AIR IS LEAKING FROM THE HVAC MODULE AROUND THE BLOWER MOTOR RESISTOR.

CORRECTION:

REMOVE THE BLOWER MOTOR RESISTOR LOCATED AT THE TOP OF THE HVAC MODULE JUST BEHIND THE GLOVE BOX LINER (FIGURE 1). APPLY RTV SEALER (P/N 12345739 OR EQUIVALENT) AROUND THE MATING SURFACES OF THE RESISTOR AND MODULE AND INSTALL THE RESISTOR.

NOTE: PLEASE TAKE CARE NOT TO ALLOW ANY SEALER TO REACH THE RESISTOR COILS THAT BECOME VERY HOT WHILE IN USE.

SERVICE PARTS INFORMATION

P/N DESCRIPTION QTY

12345739 RTV SEALER 6/3.35 OZ. TUBES

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME D1000 R+R RESISTOR - NON A/C USE PUBLISHED LABOR OPERATION D1002 R+R RESISTOR - WITH A/C TIME

FIGURES: 1

CAPTIONS: FIGURE 1 - BLOWER MOTOR RESISTOR

Object Number: 94757 Size: SH

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.