Just a thought. After testing your thermastat to see if it is opening all the way. And after testing your coolant for correct coolant to water mixture and disscoloration or coolant. (brownish is a sign of rust) But both those test are good. Check your water pump impellar for cracks or chunks missing. Just a little short cut if you find small bits of rubber in the thermastat housing your impellar is bad. Good luck with the problem.
If you can't run with the big dog's. Then chase the smaller one's.
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