Could be as simple as clogged radiator(outside) - experienced the same scenario going up Vail pass several years ago - a/c on full blast on heavily loaded Trooper - temp started to rise;stopped at one of the do it you self car wash and cleared the a/c condensor and radiator with caked on mud - issue never did resurface again on this trip to/and from Jersey.
Another scenario - going on a camping trip near Virginia beach on 4th of July - temps in the high 90's - truck fully loaded with 5 adults & 2 kids with 2 bikes and thule box on top with cargo basket in the rear - temp would rise up if I push my speed past 70 - lower speed and idling in traffic or just idling for food stop etc, temp remained in the normal(middle). Higher speed with the amout of weight(and the brick aero dynamic of the truck) was just too much load for the cooling system to handle.
I am now having an issue with the motor running hot only when the a/c on, whether city or highway driving. I'm guessing that my water pump is going south(have done drain/fill several times already).
By the way, good luck with the truck. If I am going to build up a rig again, I'll buy a Toy LC '97.
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