Did you put a pressure tester on the cooling system to see if it bleeds off
in pressure? Are you loosing coolant? Cracked head? Did it overheat real bad
prior to all of the problems you have now?
check your idler pully tension,
also check that your serpentine belt isn't glazed
might also want to check the performance of your tranny. if it's
also, I know that you'd have ruled this out but if the car has a bra
or some other restriction (big fog lights) that will reduce cooling
Failing that you could have some obstruction in the engine somewhere.
You'd have to reverse flush it and measure the flow to rule that out.
Best of luck & Merry Christmas
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