Sierra 3500 4WD V8-6.6L DSL Turbo (2007)
Control Module HVAC: Customer Interest
Cooling System - False Low Coolant Level Warning
Bulletin No.: 08-08-49-002
Date: February 13, 2008
TECHNICAL
Subject:
False Triggering Of Low Coolant Level Warning Message (Reprogram HVAC Control Module)
Models:
2007-2008 Chevrolet Silverado 2500 and 3500 Heavy Duty Series Only
2007-2008 GMC Sierra 2500 and 3500 Heavy Duty Series Only
with 6.6L Diesel Engine (VIN 6 - RPO LMM)
Condition
Some customers may comment that a "COOLANT LEVEL LOW ADD COOLANT" message is displayed in the Driver Information Center (DIC) even
though the coolant level is normal.
Cause
This condition may be caused by a false reading during off-road driving or in high slush conditions.
Correction
A revised calibration has been developed to address this condition. Technicians are to reprogram the Heating Ventilation and Air Conditioning (HVAC)
control module with the latest software available on TIS2WEB. Refer to the Service Programming System procedures in SI. As always make sure your
Tech 2(R) is updated with the latest software version.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
