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What would be the correct rating for thermostat for use in a lot of climbing on 1999 Ford Expedition

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Using we're theirs a lot of hills 80%
(1) Answer
is the vehicle overheating? If so I would take the old t stat out to see what # is on the t stat if its a 195 degree t stat I would try putting a new one in if that doesnt help then I would try a 180 degree