2007 GMC Envoy thermostat

Asked by Nov 30, 2015 at 02:45 PM about the 2007 GMC Envoy SLE-1 4 Dr SUV 4WD

Question type: Maintenance & Repair

I have a GMC Envoy and recently had a newer motor put into it. two days
after the replacement, the "check engine" light came on. Of course, I called
the mechanic who replaced the engine and he said that the thermostat is
most likely good, seeing as that it is not overheating or running badly, but
that the sensors on the motor and thermostat may not necessarily be "in-
sync". I did not replace the thermostat yet, and we have had warmer
weather, so the light remained on As soon as the ambient temperature
dropped below say 40 degrees, the light went out. Again, the weather
warmed up and the light came back on. This morning, it was 31 degrees
outside and low and behold, the light is out again. I am just wondering if the
ambient temperature has any effect on the thermostat (thus the check
engine light)?

1 Answer

40,115

No connection to the thermostat. The t-stat only senses coolant water temperature and if your car is running at a normal temperature then the check light would not come on due to the car running hot. BTW the thermostat is purely mechanical and has no electrical connection. There are other temperature sensors that are electrical.

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