Kind of why I'm holding off on the swap. I do have all the parts. But I want to know if I can actually nail down the real issue. Cause obviously I'm reading temp on my scanner even when the vehicle isn't.Thanks for the detail.
I see other GM cars and trucks have had the same issue.
In some cases, it was the T-stat.
In others apparently not.
I blame it on an over complicated mess what with all the modules "checking in" and having to chat over that internal vehicle network.
More and more it's sounding like some intermittent connection somewhere or. . . . just some coding error or timing error in the data. But why would the engine coolant temperature data have to be so glitchy then ?
Such a pricey and pain in the butt job to replace that T-stat and/or ECT sensor only to find out they are not the problem.