Check all of your hoses for leaks. i had a pinhole leak and couldn't find it in my '93 T-Bird. It ended up being in my upper radiator hose and I couldn't figure out why it was overheating. I finally found it after I shut it off and heard a hissing. I opened the hood and saw the pinhole. Right after I closed the hood (thank goodness), the hose completely exploded and blew itself in half. So you may want to replace all your hoses, or at least check them out to be sure. Also, check to see if you have any sludge buildup in the bottom of the radiator or the surge tank (fill tank).
Rick
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