TrailBlazer 2WD L6-4.2L VIN S (2003)
Temperature Gauge: Customer Interest
Engine Controls - Above Normal Temp. Gauge Readings
Bulletin No.: 04-06-02-005
Date: July 27, 2004
TECHNICAL
Subject:
Higher Than Normal Engine Coolant Temperature Gauge Readings (Reprogram PCM)
Models:
2004 Buick Rainier
2002-2004 Chevrolet TrailBlazer, TrailBlazer EXT
2002-2004 GMC Envoy, Envoy XL
2004 GMC Envoy XUV
2002-2004 Oldsmobile Bravada
Condition
Some customers may comment on higher than normal engine coolant temperature gauge readings when operating the vehicle in very high outside
ambient temperatures, and in stop and go or slow moving traffic.
Cause
Reduced air flow across the radiator and preheated air from stopped or slow moving driving conditions from traffic congestion may result in normally
higher engine coolant operating temperatures as indicated by the temperature gauge.
Correction
Technicians are to reprogram the PCM with an updated software calibration. This new service calibration was released with TIS satellite data update
version 7.3 available July 7, 2004. As always, make sure your TECH 2(R) is updated with the latest software version.
This new calibration will cause the PCM to command small amounts of additional fan engagement to control engine coolant temperatures and gauge
readings closer to a customer perception of normal.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
