No blower motor on a 1999 Ford Taurus

Does it have power and ground at the motor connector ?

see if you have high if you do replace the blower motor resistor could be a possible blower motor it self see if it turns freely by hand.

Start by checking the fuse. If the fuse is good, then either the blower motor is bad or the blower motor resistor pack is bad especially if this problem started with the lose of some of the speeds as in it only worked on high. It can be the speed control itself is bad but rarely does it go bad. You can check the motor by applying 12 volts directly to the motor to see if it is good.

Check your idle speed control motor sit on TBI.

I GUESS THATS THE FULL SPEED, WHICH MEANS THE RESISTOR BLOCK MAY HAVE GIVEN UP, OR JUST THE SWITCH HAS GONE

If the blower motor not blowing,and it is on high, bump the lower motor to see if it will try and start working again,if it does,replace the blower motor.If it does not,then replace the blower relay.If this only happens on the lower speeds,replace the blower motor resister,witch is mounted very near the blower motor in the blower box,with two screws,and about 7 wires going to it.

The blower motor isnt hard to replace. A couple of quick questions though, did you check the fuses and relays? Secondly, sometimes the motor can develop a bad ground, did you check that? The blower motor is located under the hood, on the passenger side, on the firewall. It's kind of round looking, and has an electrical connector plugged into it. Turn on the key, put the fan speed selector on high, and jiggle the wiring connector on the blower motor. If nothing, unplug it, and look at the prongs inside the connector. If they look corroded or rusty, try to clean them up with a small wire brush. Otherwise, to remove the motor, simply remove the small bolts that hold the motor in place, there may be 5 of them. Take it out, and replace it with the new one.

I had a similar problem with my 03 Taurus. Does your floorboard on the passenger side get wet when it rains really hard? If so, Ford is aware of a defect above the fan motor which is behind the glovebox.
I contacted Ford directly and they had my local ford dealer fix it free and they gave me money towards a new blower motor which shorted out from the leak, it's possible it just your switch if there is no leak but you might need both the switch and blower motor replaced like I did. Hope this helps.

sounds like the blower motor resistor which controls blower motor speed has a short and needs replaced.

I hope you are ready for this one. The entire dash has to be removed to replace the blower motor. It one of Fords better ideas if you know what I mean. Its not a job for the faint of heart. It is a pain. Once the dash is removed, it is very easy to get to. I hope this is helpful.