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Discussion Starter #1 (Edited)
I have a 2008 Cobalt and the engine temp keeps going to ____ and the engine light comes on. I remove the Engine Module plug and clean it and mess around with the other plugs in that area and the light goes out and temp display returns. This morning the temp quit at about 69 degrees C. The temp was hovering there?????
 

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Try cleaning the connector on the coolant temperature sensor or replace it altogether.
 
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