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I had this problem with my '96 Passport - it would run cool most of the time, but then if I went up a hill, or ran on the highway it would overheat. If yours does this then the problem is capacity - that means your radiator is clogged, probably by hard deposits that can't be flushed. I tried flushing mine in both directions with heavy duty flush and it didn't do a thing. I replaced the water pump, thermostat, fan clutch, and all hoses. Still overheated. Then I replaced the radiator, and that solved the problem. At least now everything is new...
Hope this helps.
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