coolant leak

I have a problem with coolant leaking from somewhere under my 1993 grand marquis. At first it was my heater core which got repaired but now it is coming from somewhere else. please help.

You need to pressurize the system to help locate the leak. A pressure tester looks a little like a bicycle pump. Check with your local chain auto parts store to see if they have a loaner.

Where the leak is coming from? Could be any number of places.

hose
corroded freeze plug
crack in the block or head
bad gasket
corroded pipe