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I have a 07 HO and I tow my 5000 lb trailer in the mountains on a hot day and the guage has never gone past half.... what you need to do is test the coolant temp when the guage is over half to see what its actually at because you may have a bad sensor or pcm.
And this is what worries me. I mean i had this same truck w/ the 3.7 v6 and same trailer and it never moved that much! Anybody think I should trust Big O to look at this? I am taking my truck there tomorrow for a basic oil change and tire rotation.