okay, first, greasefingers...i don't think it is a headgasket, because i don't have any white smoke. i wish it were so, easy to diagnose and fix.

sunder, 275? okay, i read somewhere that 235 was boiling point under 16 lbs pressure. i'll take your esteemed word for it. and yes, you have hit it on the head, i am losing water, but there is no boiling sounds, actions. i just have to add water every day to the overflow tank. i am running straight water at this point because the coolant was getting expensive....and yes, i know it's bad for the water pump, etc. yes i know a mechanic with toys... what is this IR tester? is it infrared? is it a kind of dye that can be put into the water? thanks again in advance....Rob