Cavalier L4-2.2L VIN 4 (1998)
Idler Pulley: All Technical Service Bulletins
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.
Parts Information
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