These were poorly designed units and have no replacement parts available. Don't buy one from a junkyard--you'll have the same problem with that one.
You can buy a new regulator/motor assembly from any auto parts store. Then follow the directions below:
Here are complete step-by-step instructions (with photos) on how to remove a door panel:
Here are complete step-by-step instructions (with photos) on how to test a power window motor to determine whether the problem is in the motor/regulator or the switch/wiring
In my experience, the manufacturer used parts that weren't meant to be re-used. Before you rip apart the door, test the motors and switches. It isn't clear whether the motor is burned out, or the switch's contact points are worn. It might be cheaper to get a simple multimeter, and check the switch. To do this, you just need the take the multimeter's wire leads, and connect them to the power in (12+) and power out (to the motor). Turn the multimeter to the picture that looks like a triangle with a line bisecting it, and check the display. Once connected, depress the switch. If the multimeter reads something, then the problem is the motor. A boneyard might have replacements for both of these parts, but if you could isolate exactly what is causing the problem, it would be far cheaper than to simply replace the whole assembly.
Note: The best place to find a cheap multimeter is at a surpluss store. They usually need their battery replace though, so don't trust the readings until the battery has been replaced. Another benefit to these meters is that they can't be burned out by slight over voltages, and they don't have polarity (you can hook them up both ways without destroying them).
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