Silverado 2500 4WD V8-6.0L VIN U (2004)
Fan Clutch: Customer Interest
Engine - Overheat Condition Snowplow Equipped Vehicles
Bulletin No.: 04-06-02-006A
Date: June 24, 2005
TECHNICAL
Subject:
Engine Overheating (Replace Fan Blade Clutch Assembly)
Models:
2002-2005 Chevrolet Silverado 4WD 2500 Series
2002-2005 GMC Sierra 4WD 2500 Series
with 6.0L Gas Engine (VIN U - RPO LQ4)
and Snowplow Provision (RPO VYU)
Supercede:
This bulletin is being revised to add the 2005 model year. Please discard Corporate Bulletin Number 04-06-02-006 (Section 06 - Engine/Propulsion
System).
Condition
Some customers may comment that the engine is overheating. This condition mainly occurs on 4WD 2500 series models that are equipped with a
snowplow.
Cause
A lower fan clutch disengage speed, resulting in insufficient airflow passing through the radiator to trigger fan clutch engagement, may cause this
condition. The snowplow may also contribute to interrupted grille airflow, which results in the fan clutch not sensing the warm air coming off the
radiator and consequently not engaging the clutch.
Correction
Replace the fan blade clutch assembly with a new fan clutch that has a higher disengage speed.
Parts Information
