coolant leak

hello all i got a 90 olds cutlass supreme international 3.1 v6 and i noticed yesterday when i got out of the car it is leaking coolant the back of the engine where the transmission is drivers side and i cant seem to find where its leaking from??? anyone got any idea where it could be leaking driving me nuts i took the air filter hose and everything off and cant find it so im woundering if its somewhere i cant see if someone can help me that would be great

i got the 96 3.1 but mine leaked around on the transmission towards the drivers side and it was intak gaskets thats jus a suggestion by some leak tracer dye and put it into your antifreeze and get a black light you should find tha leak that way