If you have a Low Coolant message on the dash, you first check the coolant level and then check the sensor. What if you can’t find the sensor? SureTrack community member Chryslercorey had a Chevrolet Silverado in the shop that they couldn’t find the coolant level sensor on. They posed the question to the community, and with the help of fellow community member dmckemie12 and others, they were able to resolve the issue quickly.
The following Community Fix summarizes the interaction between members of the community that led to the solution.
2012 Chevrolet Silverado 1500 5.3L
Low Coolant message, replaced HVAC control head.
Customer states that Low Coolant message appears on dash.
Diagnostic Steps Performed/Parts Replaced
Low Coolant message displayed on dash. Coolant level is fine and cannot find level sensor. Does not appear to have a harness for the sensor. Have looked all over overflow tank doesn’t have a provision for a sensor?
Best Answer from Community Member dmckemie12
The HVAC control head didn’t, by chance, get swapped with one from a diesel did it? Gas engines didn’t use low coolant sensors on these years, but diesels did. The low coolant sensor is monitored by the HVAC control head.
Pulled the HVAC control head and found it was a salvage part. No way to tell if it was a gas or diesel. Replaced it with one from a gas vehicle and no more message on dash.
Replaced HVAC control head, no more Low Coolant message on dash.
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