Cooling System - Coolant Warning Light in Cold Weather
01 Coolant warning light comes on in cold weather19 11 21
2014859/3
March 9, 2011.
Supersedes Technical Service Bulletin Group 19 number 08 - 08 dated November 17, 2008 for reasons listed below.
AFFECTED VEHICLES
CONDITION
Coolant level warning activates after cold start. The warning light deactivates after running the engine for a short period, allowing the engine coolant to warm up.
TECHNICAL BACKGROUND
The coolant level warning light in the instrument cluster may activate during cold starts at temperatures under (4°C) 40°F due to high contact resistance caused by deposits on the electrodes in the coolant reservoir.
PRODUCTION SOLUTION
An improved coolant reservoir with longer level sensor electrodes is installed during vehicle production.
SERVICE
1. Verify correct coolant level and make sure that the coolant temperature gauge functions correctly.
2. Compare the coolant temperature in the measured value blocks of the engine control unit/instrument cluster during a short test drive. The displayed values should be roughly the same.
3. If the coolant level is correct and the gauge is functioning properly, replace the coolant reservoir.
WARRANTY INFORMATION
REQUIRED PARTS AND TOOLS
ADDITIONAL INFORMATION
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.