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Check the heater hoses to see if they are still hot when the air goes cold. If the hose are hot it is not a cooling system problem but a temperature blend door problem. If the hoses have a different feel to them,one hot and one cold or warm, it is a circulation problem and the coolant is not moving through the heater core fast enough to keep the air hot out of the vents. This usually ends up being a clogged heater core.
Sounds like your heater blend doors aren't adjusting from cold to heat. If you google "blend doors" you can read about them. They are usually pretty hard to get to, the dash needs to come out. Hope this helps!
When you turn the heat selector from hot to cold you should here a difference in the way the air sounds when it comes out of the vents.
If the heater core is plugged than usually one of the heater hoses will feel a lot hotter than the other. If this is a taurus they are well known to plug the heater cores. I would bet that the coolant looks like mud also.
I have had a good success rate back flushing heater cores with a garden hose. Sometimes it only takes a couple of minutes to get all the debris out and some it has taken a couple of days of repeated tries to get them clean.
feel the two hoses going into and out of the heater core. they both should be hot. if one is cold the heater core is likely plugged. you can try flushing it out to see if you can restore flow to the heater core. if they are both hot the thermostat may be sticking open tho you should have a limited amount of heat. also confirm that the vents are operating as they should be.
heater cores clog in taurus. way to know is this--engine fully hot--heat on reach down to the fire wall and grab hold of one of the heater hoses where it hooks to the core--one should be real hard to keep hold of because its that hot. If the other is close to the same the core is not clogged. But if the other is cold to the touch its clogged. You can remove the hoses and shoot garden hose water in one side or the other and break it loose usually
feel the hoses when engine is hot to see if the water is circulating,before you do anything else.If one is hot and the other cool then its not circulating,and heater core need a good flushing with some some caustic soda