rear wiper removal problems

i have a 94 taurus wagon, and i need to remove the motor for the rear wiper and i cant figure out how to get the darn thing off, i tried to get the rear wiper arm off but i dont know if i am doing it wrong or if it is rusted to the shaft, if someone could give me a walkthrough on how the heck to get that darn motor off, that would be great! Much thanks!
~Ken

The service manual for a 1993 wagon simply states:
1. Disconnect battery ground cable, then remove wiper arm and blade.
2. Remove pivot shaft attaching nut and washers, then disconnect wiper motor electrical connector.
CAUTION: Pull connector only. Do not pull wires.
3. Remove wiper motor attaching nut, then the motor.
4. Reverse procedure to install.

I thought I had a bad rear wiper motor on my Merc. Mountaineer. After removing the nut under the plastic cover, the arm slid off the spline shaft. Once I got the arm off, I noticed many of the splines in the wiper arm were flat. I tried the motor just for kicks. It worked fine. I reinstalled the wiper arm, being sure to "torque" it down. The rear wiper's been working fine since. However, the first time I turn it on and there's some ice on the arm, I suspect I'll strip the splines out the rest of the way.

To shorten this long story, on the Mountaineer, the rear wiper arm is just slid over a spline shaft. In your case, there is probably corrosion in the splines causing it to be seized in place. Once you remove the nut, if you spray a bit a penetrating oil into the shaft, let it soak a few, then pry the arm away from the body of the car, you'll probably be able to get the arm loose.

-Rod

I've got a 94 wagon also.. if you look closely at the base of the wiper arm where the splined shaft is, you'll see a tiny tab, for lack of better description, which you need to lift up in order to remove the arm.. it should come right off.. I used a small screwdriver to get under there.. use a little anti-seize when you re-assemble it. the manual makes no mention of this, one of the figure-it-out-yourself deals..

I had one rear wiper so corroded from road salt that it just would not come off. The retaining tab slid up no problem. I sprayed it with 5 different brands of penetrating fluids with no luck. They just made the tab not want to stay up, so I used a wood sliver to keep it unlocked while I used a large pair of channel lock pliers to try and get the arm off. No luck, so I drilled through the arm to the rotating spline nub and sprayed it from there. After letting it soak for a day, it still wouldn't come off, so I used a metal cutting blade and cut the arm head down to the nub at the top and bottom. I think the best advise for anyone is to get some anti-seize on there as soon as you get the vehicle, then you won't be replacing the arm.

ok, so as comet says my wiper is completly rusted on, is their any way to get that darn sucker off without a saw??