Join Date: Jan 2006
Location: central coast, california
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the problem you run into is the cooling fan is only capable of cooling the radiator so much. the engine is running at about 190 with everything operating at max efficinecy......
You hit an uphill grade, with hot temps, with the AC on, and pulling a HEAVY load and trying to get to where your going faster.....you have reached the capacity for the water pump to move enough water throughout all the passages and keep the motor cool. if you slow down to about 45 on those grades, downshift into manual two to keep the RPM's, and thus the water pump speed up.......the motor doesnt have to work near as hard to maintain 45 so it doesnt build enough heat to overheat.
What you guys are experiencing is towards the exteme end of what any motor is capable of. A gasser probably would have overheated even sooner since they tend to run a bit hotter....and it wouldnt have pulled the load that fast up the hill....
Now another point, if the temps just go up, but dont reach the upper part of the normal range, then dont worry. That "normal" range on that gauge is only about 60 degrees. It doenst take much to make the gauge move. When the gauge goes from halfway up to three quarters, it looks like a HUGE jump, but actually it was only 15-20 degrees, which is nothing to worry about......When the whole range says Normal, it is just that.....and an increase on a hill is to be expected......at least when the temps are hot