I agree with B&D...for another reason. I had a '92 Tempo that had a bad electric cooling fan. The car never overheated on the highway, because the airflow through the radiator adequately cooled the engine. But you didn't dare sit in a McDonald's drive-thru, unless you were the ONLY car in line.
So his point about cooling the engine with moving air is more than valid. And, as he pointed out, the electric cooling fan is adequate to regulate engine temp at an idle. I'd guess the stat is stuck, but not stuck completely closed.
And what year did GM switch from vacuum controls to electrical/electronic servo motors on the temp and blend doors?
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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