I have a 1993 Thunderbird LX and coolant is apparently leaking into the exhaust system. I see white smoke coming out of the tailpipe, and the coolant leaks out of a crack in the muffler. Do you have any idea about where it's coming from or suggested repairs?
Sounds like a blown head gasket. This most certainly can happen to some Ford 3.8-liter V-6 engines once the mileage accumulates.
Stop driving the car before any more damage is done. A portion of the head gasket has deteriorated at a coolant passage between the cylinder head and the engine block. The coolant then goes directly into the cylinder and gets pumped out into the exhaust system.
Get it to a qualified technician, and he'll pull the cylinder heads and inspect for cracks and warpage. Make sure that both head gaskets are replaced and both cylinder heads thoroughly inspected. It would be ridiculous to do just one side because most likely the other side won't be far behind. Good luck