No heat- fan blows but no hot air - 2001 Ford Taurus

How hot is the engine running in degrees f? Does the radiator fan run?
With hvac turned on, check voltage and ground at the blower motor. If good voltage and ground, suspect the blower motor is faulty.

No Hot water circulating in Heater pipe or On Off valve is stuck.

Heat control switch is bad if you turn it all the way cold and it still blows hot air.

The resistor controls fan speed, not temp.
If the heat comes and goes, it could be the thermostat, or the radiator could be low on coolant, or have air pockets, or one of the blend doors may not be working correctly.
The blend doors direct air thru the heater core and the vents.

There are a few thing that can cause the heat not to work, this all depends on what you mean by no heat, is the fan blowing air but not hot or is the fan not working at all?

i will say to heat the coolant level in radiator and make sure it is full, this is if fan blows but not hot. let me know, good day

For this types of problem,i suggest you to check this help links:----Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html
---------A/C, heater, defroster fan, not working?http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html
--------Heater problem?http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html
---------Engine Overheats and heater blowing cold?http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
-----------Heat blows cold on drivers side and hot on passenger side?http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html----------------This will help.Thanks.

If you can get cold air blowing out the front vents, the front heater door is not working properly. If you don't get air blowing out, check the front heater fan and its resistor block.

If the heat blows hot, the defrost should also. If the heat does not blow hot air, it could be your thermostat, your heater core valve, or the heater core itself. with the vehicle being a 2002, the heater core is the least likely.

the unit were you turn on the fan leaks vacuum which causes the vents not to blow properly the unit is not expensive for it is plastic comes with fan switch ex..

did you check the fluid level by removing the rad. cap? Radiator should be full to top. If Chryslers are low on coolant, the heater will not blow warm air.