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I have a 2008 GMC Envoy. This morning the engine coolant temp. gauge never moved, it stayed at cold while I was driving. The engine never got hot, the gauge just won't register. What do you think the problem is? Thank you.


   
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many times the sending unit is the culprit. It could be a loose connection or a bad sender. I have seen where the stepper motor in the instrument cluster has stopped working also but the sender is the place to start.

Using a scanner and look at the coolant temperature. It should give you the digital temperature if the sender is working. If the computer does see the correct temperature then I would start looking the gauge unit. You should get a check engine code coming up if the computer doesn't see the temperature come up to normal operating temp after a while. (P0128)


   
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Thank you.


   
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