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

Using we're theirs a lot of hills 80%

Asked by for the 1999 Ford Expedition
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