A/C - Whistle Noise at High Blower Motor Speeds

Group Ret.: HVAC

Bulletin No.: 361103

Date: February, 1994

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: