I jsut got a 1990 240 wagon and found the front passenger window won't go down. I read that I should start by replacing the switch. Can anyone help me with this? Is it hard? Thanks, Elaine

With some small screwdrivers you can remove the switch panel from the door. Then the switch can be unplugged (the switches only plug in one way) and taken inside where it's warm to work on it.
Unsnap the switch from the trim panel that surrounds it. Pry open the sides of the switch gently, to release the bottom piece of the switch that has the plug pins on it. The rocker will separate and a pair of metal seesaws and a pair of ball bearings will fall out.
On the bottom plate, you'll see the contacts. They're silver and probably a few are burnt black. Take a file and sand down the burnt ones until they are smooth and not pitted. Replace the two seesaws, lay the ball bearings in the bottom V of them, and align the rocker to the center position. Its two fingers need to line up with the BB's. The whole thing snaps back together and you'll know it's ok by the action of it. If it feels right, it'll be working right.

Plug it back in and the switch should work right. I did this recently for all 7 switches in my wife's 82 wagon. They now all work right. About 2 switches worked before.
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Rob Bareiss, New London CT ::: Roterande Fläkt Och Drivremmar!

hi!

I just had this problem recently! if you scroll down a bit look for "HELP..." in title :P you do NOT really need to remove armrest (found that out a bit too late). use a flathead screwdriver and gently pry up the control console. once that is out, you will see a connector with wires plugged to the switch. it's a pain to just disconnect the connector from the switch with yer hands, so use a small, thin screwdriver and use it as a leverage to separate connector from switch (I believe it's a 5-pin plug). do this gently. the next tricky part is to pry out the switch from the console. use a flathead screwdriver and GENTLY slip it into one end of the switch. GENTLY leverage it out from the bracket. do the same for the other end. GENTLY or you will break something! not a big deal if you break the bracket on the console, but nonetheless discouraging. the easy part comes when you plug the connector to the new switch--DON'T snap switch back into console yet! with switch plugged to connector, test it to see if window now works. if it does, put new switch back into console and snap console back into armrest. hope this helps. I've learned it the hard way.

edit to add: does pass-side window work using the master/driverside control?
also check fuse #10--it should have a 16amp fuse (red).

Start here ...
http://www.brickboard.com/RWD/index.htm?id=907847
may give you some ideas how to get started ... likely either the switch, the fuse, or the connectors at the switch or the motor.