If your seeing 12 Volts at the switch even when you press it, the switch is shot.
Whats the voltage across the motor when you hit the switch?
If you want to wait till after the weather clears to mess with it, I suppose you could force the window up after removing the door panel, but be carefull or you'll be replacing glass as well as a switch / motor.
If it seems like its going to require alot of force to push up, just unbolt the motor and use a board to prop the window up for the time being
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