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How to fix an off track window
Remove screws and bolts along the interior of the car door.
Before fixing the window, you'll need to get access to the inside of the car door. For smaller problems like an off track window, you can do this by removing the interior car door panel, the plastic cover concealing the car's window mechanisms.
These are typically held in place by simple screws and bolts, meaning you can remove them using a screwdriver and wrench. If the fasteners are particularly tight, use a power tool instead of a manual one.