I was losing coolant due to it coming from the weep hole in the water pump (just checking the reservoir level and was was always losing water). So i replaced the water pump and thermostat thinking that should be it. Still losing water. Next I found that the radiator had a leak, so I replaced the radiator, cap, and the hoses, again thinking that should take care of it. Still losing water. So at his point I've got it in my head that it's a bad head gasket, so I take it in have the gasket replaced, the head gets pressure checked and machined and i also have the rods, rocker and lifters replaced while he's in there. Now I'm confident, should be fixed, right? ...No, still losing water! Anyone have anything similar or any ideas!? This is driving me nuts! I should mention that I've mostly just been checking the reservoir and it's always lower than the last time I checked it. Also it's a 2000 sport 4.0. I'm trying to make an appointment this week to get the block tested I guess, it's the only thing left that I can think of. Any ideas would be great, thanks!