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Originally Posted by SpeakersGoBoom
original radiator, but was boiled or steamcleaned (cant remember which, but i think it was boiled) when the new engine was put in.
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Well, I'd check the fan operation first. Let the car idle in your driveway, and watch the temp and see if the fan turns on. If the fan kicks on when it's supposed to (around 220, I think) and the temp still climbs, then it's a problem with flow; clogged heater core, clogged radiator, or stuck thermostat. A 180* thermostat may help, instead of the stock 195*. If you wind up replacing the radiator, get a Modine 951. It's a single core aluminum rad. with plastic tanks; stock replacement for a late third-gen F-body. I think your car prolly still has the copper rad. in it.