Window regulators are the mechanism behind the glass — a scissor or cable-driven assembly that raises and lowers the window when you operate the switch, usually paired with a motor on power windows. A worn regulator often causes a window that moves slowly, drops into the door, binds partway, or makes a grinding noise, and the cable-style units in particular are prone to snapping with age. Browse replacement window regulators, with and without motor, for cars, trucks, and SUVs to get smooth, reliable window operation back.