HVAC Blower Motor - Whine

Bulletin: 93-1-8

Date: April '93

Ref.No.: 93-135-1

Corp.Ref.No.: 331206

SUBJECT:
HVAC BLOWER MOTOR WHINE (REPLACE ISOLATOR AND FOAM SEAL)

MODELS AFFECTED:
1992-93 ROADMASTER

CONDITION:

Some vehicles may have a whining sound when the blower motor is operating in low blower mode.

CAUSE:

The blower motor isolator does not isolate blower motor vibrations from the air conditioning module satisfactorily.

CORRECTION:

Replace existing isolator and foam seal with softer isolator. Fasteners must not be torqued over the recommended specifications, 1.9 N-m (17 lb.in.), or the effect of the isolator will be negated. Use P/N 52465887. Disregard the number stamped on the isolator, refer to packaging to identify the correct part number.

For 1992 Roadmasters, refer to Section 1B, Page 21 (Blower Motor and Fan Replacement) for procedure.

For 1993 Roadmasters, refer to Section 1B, Page 23 (Blower with Impeller Motor Assembly Replacement) for procedure.

VIN Breakpoints for the new isolator are: Arlington-PR414675 and Willow
Run: PW404110.

PART AVAILABILITY:

Parts are expected to be available on 04/26/93.

WARRANTY INFORMATION:

Labor Operation No.: T1946
Labor Time: 0.4 Hr.