I have a 2001 ford experdition my heat and my air will not work but the fans works what should i do

There are doors in the heater case, operated by vacuum hoses that open and close them. Yours need to be checked, as they are not working. If they were working you would have warm air, not cold.
What about the fans? They don't turn on, or they don't turn by hand freely? They should be free-wheeling when not on, spin them by hand to check. If your air conditioning is actually working as intended, then one of the fans should be on when AC is used. The other fan (on driver's side) doesn't turn on until the coolant reaches a certain temperature, and it is a pretty high temperature. You probably should have the coolant system checked out.

there are two fans, one comes on with the air con, the other when operation temp is reached . check fan fuse and censer if ok check fan motor.

Many newer models use the air conditioner compressor as a heat pump to defrost the windows.

Check the freon level on the air conditioning system, or at least bring the vehicle into a warm heated garage and run it just a minute or so to test to see if the AC is working.

Be sure to only run it a minute or so or better yet ventilate the exhaust out of the garage to prevent buildup of deadly carbon monoxide gas in the garage or house.

You can try shifting into manual 1 to get moving then once you get going shift the lever up into Drive. This should work, then drive it to a shop to have your ****** looked at.

check all the fuses under the steering wheel and under the hood

Get the exhaust checked out and also the plugs and leads and including coil pack.

If still the same then it may be an air sensor or EGR fault.

there is a flapor motor that is controled by vacume, check for leaks in the vacume lines on the engine.

GM uses vaccum to operate the blend doors on their heating and air conditioning systems. There is either a cracked hard plastic line or a cracked, unplugged vaccum line somewhere. If you have done any work to the vehicle latelt I would start by looking there first.
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Have you tried replacing the heater core ? If the flushing of the heater core did not work, the heater core may be bad. Very clogged with gunk and residue. did you try to check the valve that opens the hoses to the heater core. This valve can be vacuum, opened by cable or electric. Check to see if the hoses get hot at the firewall. they should be hot.

the cooling fan will always come on when using the a/c,so it is not a fan problem,sounds like the pcm is not getting a signal to turn cooling fan on,could be coolant temp sensor.