OK I done a bunch of research and still cant fine a decent answer so maybe this will help(since I new to this forum be nice) I notice the other day that I had a coolant leak. the leak happen after sitting in the fire station bay for two days not ran or nothing. it was a very small leak and only thing I could tell was a couple drop on bell housing(driver side) and front drive shaft u joint. I the best I could tell it coming from some where by the oil filter. I look on top side of motor cant see nothing and all round the head and cant find nothing. look over a egr and no fluid there that I could find.! :banghead: I guess the leak is so small it not showing its ugly face. Also no pressure on rad. hose, no milky oil. Any ideas?