SOLVED! 2012 Acadia running hot

m.mcmillen

Gold Supporter
I've been having some trouble lately with my 2012 Acadia running hot while going down the highway (around 70MPH). The temperature gauge would start creeping up and get up around 230. I found that if I accelerated or downshifted that it would cool off.

I checked the radiator and changed the thermostat and nothing helped. I was going to pull the water pump off and look at it this morning but when I went to start it, the engine struggled to start. I looked at the coolant temperature gauge and was up a little bit off the bottom. That wasn't right because it sat all night and it was 30 degrees outside.

I changed the coolant temp sensor and it seems to have fixed it! I drove it about 20 miles and watched the gauge and my scan tool and it never went over 210.

Hopefully this will help someone in the future.
 

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