Heater Air Conditioning Unit - Whistling Noise
Bulletin 87-1-9Date July '87
Ref. No. 87-138-1
Corp. Ref. No. 701102
SUBJECT: WHISTLE NOISE IN HEATER AIR CONDITIONING UNIT (C60) EQUIPPED CARS
MODELS AFFECTED: 1987 LESABRE MODELS (H37, H69 ONLY) 1987 ELECTRA LIMITED MODEL (X69 ONLY)
A whistling noise may occur during operation of the Heater-A/C fan. The whistling noise is most objectionable at the middle fan speed and the pitch gets higher as fan speed gets higher. The whistling noise is most noticeable with the fan running and the vehicle standing still.
VEHICLE RAISED ON HOIST:
The correction is to extend the heater ventilation air condition case plastic drain with a rubber tube 1/2" I.D. x 2" long, Part Number 3053706, using clamp 477402 (or equivalent hex worm gear). This can most easily be installed with the vehicle raised on a hoist (see attached Illustration).
WARRANTY INFORMATION
Labor Operation Number: T5144
Labor Time: 0.2 Hour
Trouble Code: 92