Idler Pulley - `Hoot/Whistle' Noise on Cold Start Up

File In Section: 06 Engine/Propulsion System

Bulletin No.: 01-06-01-004

Date: January, 2001

TECHNICAL

Subject:
Hoot/Whistling Noise At Start Up During Cold Ambient Temperature
(Replace Idler Pulley Assembly)

Models:
1998-2001 Chevrolet Cavalier
1998-2001 Pontiac Sunfire with 2.2 L Engine (VIN 4 - RPO LN2)

Condition

Some owners may comment on a loud "hoot" or whistling noise from the engine compartment during start up at cold ambient temperature of 0°C (32°F) or less. The noise would be of short duration, 5 seconds or less, and would not re-occur until the next cold ambient start up. This characteristic makes the condition difficult to diagnose in the dealership environment.

Cause

This condition may be caused by the bearing in the idler pulley. This condition will not occur when the engine is warm. A newly designed idler pulley is available from Service Parts Operations. The new pulley has a bearing with improved cold temperature performance characteristics.

Correction

Replace the idler pulley assembly. Refer to Service Information for replacement procedure.





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