I have noticed that most questions on this forum have to do with vehicles running cool. Not a problem here, believe me. The problem is the M1114 up-armored HMMWV with the 6.5. I know they have some added wieght to haul around but on a mild day here in the desert I watched the temp guage throughout a convoy and it rode between 230 and 240. It got to a point that I was about to demand we stop to let it cool down but luckily we made it to a stopping point so it had a chance to cool. Talking around this seems to be a common problem with them but I've never heard of any problems from people that have the 6.5 in their pickups. My dad has had several with no overheating problems. Is their a design flaw with the Hummer body that contributes or is it just the added weight combined with the fact that you can't keep the sand cleaned out of the radiator for more than ten minutes? Any info would be appreciated, especially from the Hummer guys.