Possible that coolant is leaking into combustion chamber and burning off. Does engine act like its missing at idle and smooths out at higher rpms? possible head gasket. I had the same problem i used steelseal.com worth its weight in gold.
You need to fix these leaks or replace the radiator unit.dordor77@netvision.net.il
Those are signs of a blown head gasket or a cracked cylinder head.
Losing coolant with no apparent leaks, White smoke out the exhaust that has a sweet smell to it,
Most connections / joints between parts have a gasket to prevent leaks. So a failed gasket is a typical cause of leaks, including where the exhaust pipes connects to the exhaust manifold.
it sounds like your coolant over flow tank is leaking. it is a common problem with these cars. might also check your radiator for leaks or your exhaust for coolant, but if there is coolant in your exhaust that would mean blown heads
lack of coolant, check for leaks.
Engine oil mixing with coolant and/or coolant mixing with engine oil.Losing coolant but don't see any leaks. White smoke (steam) coming out the exhaust that has a sweet smell to it.
What can cause black sooty exhaust is bad valve guides. When the guides are bad oil leaks into the cylinder when the car isn't running. When the car starts it produces black exhaust.
How To Find & Fix Coolant Leaks http://www.aa1car.com/library/coolant_leaks.htm
Probably the thermostat is sticking.
A crack near or on the thermostat housing can cause a coolant leak in a 1996 Grand Marquis. The thermostat housing is located near the manifold on this vehicle.
Seems the flexpipe leaks at the ends...