It is a 1989 Lincoln continental, it was really low on coolant I added coolant then started car and turned heater on so that i could add more but, did not seem to need much more. Took it for a drive and engine started heating up and heater blows cold air. Any suggestion?
Same thing happened to me in a Taurus. It turned out that there was a bubble of air trapped somewhere in the cooling system and that was sort of "vapor locking" the flow of coolant. No flow, no cooling, so for years the engine would frequently overheat, but no flow also means nothing going to the heater core so the air blowing through that stayed cold. I had a pressure flush on the coolant which removed the air bubble and I haven't had the problem for 3 years now. One other possibility -- if your antifreeze/water mixture isn't where it should be, you can get a bit of ice that can block the flow of coolant and produce the same symptoms. That melts fairly quickly though and things will very suddenly go back to normal (until the next really cold day).
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