Have a 94 buick roadmaster. Power window will go down but will not go back up. This problem is only on one window (front passenger). Any help given will be appreciated. Thanks.

Does this happen for either switch (Drivers/passengers) ?

Sounds like the Window Motor.
You need to remove the Door Panel & check the 2 wires at the Window Motor for Voltage.
It will be a Reversal Rest at Ground Circuit.
Key On
Switch held in Up position
One wire will have 12 Volts +
One wire will have Ground

Switch held in Down position
The wire that had 12 Volts + is now Ground
The wire that had Ground is now 12 Volts +

If Voltage test checks good, Replace Motor
If Voltage test no joy, check voltage at switch & also check for broken wires in the Door / Kick Panel Boot