Thanks guys. Didnt have alot of time to work on her like I planned truck troubles on two trucks. my 08 tundra rear axle bearing was going bad took all day friday for dealershipto diagnose and my son thought old 7.3 diesels would run without oil in it.  I did get the tstat checked while it was hot and there was no flow through tstat to the radiator removed the tstat and has plenty of flow. The rear drain by coil opened it and had full stream while tractor was not running. Will try new tstat wed after I get my truck back because the tstat was left in the tundra at the dealer fri. maybe that is all that is wrong and they put in a bad Tstat years ago and never tried another new one. Thanks and will keep you  posted as to my slow progress