The drive teeth on the gear that turns with the window motor are not engaging the teeth on the lift mechanism. They may be stripped, or just out of alignment. You need to remove the inner door panel and investigate to see what the issue is. It may be that you need to push the window up slightly to get it to engage the lift gears, and then it'll go up.
i have a 1994 olds silhouette and the front blower moter for the heat has been acting up sometimes...
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I HAVE A 1994 OLDS SILHOUETTE AND THE FRONT BLOWER MOTER FOR THE HEAT HAS BEEN ACTING UP SOMETIMES IT WORKS SOMETIMES IT DOESNT AND NOW IT WONT WORK AT ALL BUT THE BACK ONE WORKS JUST FINE I HAVE CHECKED THE FUSE AND THE RELAY AND EVERYTHING SEEMS TO BE FINE ANY SOLUTIONS TO FIX MY PROBLEM