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Buy the correct one from Kascar....should be 180-195, as cold as it is there, not sure if it isn't normal...I'm in calif, my shop,truck never get to temp...fine by me, and fan clutch stil comes on, so my gauge is most likely off.

Yep...plus I have seen many HMMWV's with no Tstat at all....missing or stuck open. Also, is your fan clutch working? is it stuck on?mthis would mean it's always in max cooling mode. disconnect the TDM connector with 2 wires on it...does the fan engage? Then plug it in and see if fan disengages...