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Premium Member
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10,732 Posts
Likely a bad sensor - had that issue with another Gm vehicle (06 SRX).
 

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8th Gen Antagonist
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13,660 Posts
I've had that several times from a bad sensor, they really don't handle contaminants well at all.
 

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8th Gen Antagonist
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13,660 Posts
It's the one plugged into the radiator underneath the filler neck, it's flat and square, plug comes out the bottom. Quite easy to change, pop off the little spring clip, and gently pry it out, they get stuck. You will lose a small amount of coolant.
 
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