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It stays low because your fan runs all the time. Air keeps the fan off. So you could have no air to the fan clutch. Or it could just be stuck from sitting before you got it. With the truck off and the air drained, take the air line off the fan clutch and hook an air compressor to it. You need...

It does sound correct for highway use. That engine makes alot of heat at 57mph you are around 2500rpms. I would still flush the coolant and I have found trucks with partially clogged radiators just from dirt and debris picked up over time. If you can get in there you can spray a hose thru the...