1990 Pontiac Grand Am. Anti freeze leaking. Replaced heater Core, Replaced water pump. still leaking. Any suggestions?.

check petcock, around hose fittings and hoses, radiator, if coming from engine and/or exhaust also, maybe replace head gasket, depending on how much you really want to keep it. maybe try using a bottle of dye and a black light at dark. wipe and/or carefully spray engine cleaner on hoses, radiator, etc first

If it's a V6, look at the lower intake manifold gaskets. Check in at GAOwnersClub.com for DIY instructions and pictures.

Rent, beg, borrow, or steal (just kidding) a pressure tester that goes on the radiator cap and it will pump pressure in to the system. Then look everywhere, but one thing..is it leaking INSIDE the car on the floor? Or puddles on the ground? if so watch your cat or whatever, they love the stuff

okay. only means heater core. they can crack too gd easy around seams. recheck your connections,the unit to hoses, maybe remove to clean and polish the male fittings and scrub inside the hoses. pressure check it again to confirm that thats the exact issue, and exchange it

Thank You all for your answers/suggestions. First point. Car has been in my family since it was brand new. Until it breaks me, I will try. 16 year old son learning from it now. Replaced Heater core after drivers side floor board flooded. (Had already replaced water pump at this point).Have not tried the pressure test yet. Have not replaced hoses yet. Looking as if it may be a defective water pump (front gasket). Dripping from lower weep hole now. at a slow small drip right now, tomorrow it may spew! (UUUGGGH) Thanks for the ref to link to owners club. .Either way water pump and heater core still under warranty. :o) Just time involved is getting aggravating. P.S I think they have modified antifreeze now so it does not taste sweet. Cat is still alive. LOL