99 monte carlo

I have a 3100 under hood and am losing cooling fluid. radiator is full. reserve tank is not. going through lots of fluid. leak appears to be on engine right in front of rt. have not got it up in the air yet. any ideas??

Get a pressure tester and see where it is coming from, look under the w/pump and throttle body.

most likely the plastic pos intake gasket. Depending on how bad the leak is, stop leak might help(GM uses it). Look for antifreeze stains under the throttle body on the block. You probably smell it don't you!!
Make sure you get the air out of the upper end of the motor per instructions