Air conditioner works, but heater does not blow hot air in any heating position. Fan works great blowing cold air in any heater setting.
Try to find video repairs on YouTube. Easiest fix would be to do a power flush to make sure your heater core isn't plugged. Worst case is your heater core is shot and needs replaced. Also it might be the heater control valve is stuck closed and won't allow warm water to flow thru heater core. Lots of work to that one too.
https://www.youtube.com/results?search_query=2002+Ford+Taurus%2C+Heater+blows+cold+air
What have you checked so far ?
Radiator full of coolant ? Heater hoses getting hot ?
HEATER NOT
BLOWING COLD,NO HOT AIR FROM HEATER,A/C BLOWS HOT AIR,A/C NOT BLOWING COLD,
COLD AIR FROM HEATER,BLEND DOOR ACUTATOR CLOSED,HVAC UNIT NOT OPERATING,
http://alltypesofpartsreplacing.blogspot.com/2012/12/heater-not-blowing-coldno-hot-air-from.html
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Most likely plugged heater core. First step would be to do a backflush of the heater core. second step if that doesn't get it is to check the heater water control valve. It is likely one or the other.
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