Cannot switch from defrost to A/C, does not blow cool air period and the A/C was charged. but not really sure if the A/C unit in the car is the right one or not.

from what I've read repair involves removing the dashboard.
there are 2 sets of temp regulators and 2 air flow directors.
both sides have their own.

Always make sure you set it to the right position. e.g, winter period turn it to the red side while in summer you turn it to the green side.

are you talk about blenddoor it on right side under dash

you either need a blend door actuator or the blend door it self if your going to replace one you might as well replace both while your in there

Relay, switch, fuse or the motor is bad. Check fuse first, then relay, then switch. If all that fails, try the blower motor

AC blows where you have your control switch set,if it only comes out your defroster have the vacuum check at the blend air doors or if you have a faulty heater control unit.

Blowing out of the defrost is a vacuum problem. You have a leak between the motor and the heater controls. Most likely needs to have the A/C system charged up.

check the vacuum on the control unit, or you can also check the cable that controls the direction doors. hope this helps

The system just needs to get all the air pockets out if you switched everything like you said look around where the radiator hose meets where you put the thermostat in, there should be something on the lines of a little nipple with a 8 mm bolt on it i will have to pull up the exact setup of your Taurus but its the same general concept your car is fine you just have a big air pocket , what else you can do is while its cold right now and the car isnt running is to go take the radiator cap off the radiator and see if the antifreeze is low now that the car has cold down since you last ran it. If so feel it up top it off in the radiator and it might hurp it self and remove the air pocket all on its own... If you need any more help feel free im always on here id be glad to help more in detail once you try that and look under the hood for the bleeder ( the thing with the nipple on it) Also if you could please rate me i would greatly appreciate it.

Thanks,
Steve

as it is a general motors product i beleive the relay is right on the compressor. check fuses and any other relays

Robert