Coolant Leak

I cant find this damn coolant leak in my g/f's 92 nissan sentra. It was leaking at the lower radiator hose, but i replaced it and its fine. Its losing coolant somewhere :-( . I think the waterpump is alright, the upper radiator hose is pressured and hot. Its not the radiator, i checked that up and down.. Someone please help !

have you checked the head gasket. if you are burning it, it wouldnt be leaking. Does it run good? Full power? Other wise get under it wipe everything down until dry then drive it and see where moister is.
good luck

ok, theres wet dirt stuff on the , umm, air dam i guess (the plastic board under the engine under the support) but it runs perfectly fine, when its cold though its a little rough, but not bad at all, not like bogging down or anything, just like the tranny is somewhat going out ( i actually think it is) . it stopped burning white smoke, and actually it never really bellowed out that much smoke, jsut a little, like it was left there for a while or something.... i dunno...
btw, the wet dirt stuff is under the engine on the ,left (passenger) side

seams like head gasket if it is giving off smoke, or cracked block maybee. i would have someone look at it if i were you.