i have a stock 90 GT w/ 115k miles. At about 110k, i put in a new 3 core rad, stewart water pump, high flow (3 holes) 180 stat, replaced an original cracked fan and replaced the original fan clutch.
the car ran too cold, switched to the standard 190 stat and all problems solved. car runs a little cooler than with the old, original parts.
watter wetter is great, so is orange Havoline Antifreeze which I believe has a watter wetter type additive already in it. I would check out your fan clutch or possible the water pump is defective.
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