Since you say this is a Taurus if figue it's got A/C.
Replace the t/stat with a 195deg and see how that does.
If heat is still cool then if you have ac look for the heater control valve (keeps hot water out of the heater box when the A/C is on)to ensue the vacuum line that actuates it is not loose,cracked,or has completely fallen off. The heater control valve is usually located in 1 of the heater hoses or it's attached to the intake manifold and a heater hose is attached to it on the other end.
If the vacuum line to the heater control valve is ok then the valve is possibly bad which may not be opening thus no hot water could pass through your heater core for heat in the car.
The heater core could simply be dirty/plugged up and need to be flushed out. This could definately be the case in an older car with a cooling system that has not been maintained properly and or has had a load of stop leak dumped into it in the past.
Also,maybe the vacuum signal from the heater switch in the dash is not working which opens the heater control valve when heat is called for allowing the hot coolent to pass through the heater core.
Or maybe since this is a Ford it goe's SOOOOOOOOOO fast all the air speeding past the radiator is super cooling it. (HA,HA,HA)
Scott