When you order a new Mercury window regulator from our site, be assured that you will receive quality parts that can stand up to the stress of heat, cold, moisture and dirt. Because window regulators are subject to those factors, the mechanical parts tend to fail over time as the lubrication diminishes. Eventually, a fastener will snap, a cable will bind up or a gasket will crumble. At that point, you will hear whirring or grinding noises when you press the power window switch or try to manually crank the window. If you do have a power window, the electrical components like the fuses and motors might be blown as a result of a jammed window regulator. When you take apart the door panel to look at the parts of the window system, you might see if the cable has become bound up, or snapped if it is a cable-operated window regulator. The issue might stem from a loose or broken fastener, rivet or bushing. Because of lack of lubrication, the weatherstripping or gaskets might have started to deteriorate, which will jam the window from traveling up and down in its channel. Sometimes, simply cleaning and spraying silicone lubricant on the channel liners will take care of the problem. Unfortunately, that is often a temporary fix to a problem that will return again. And because of the effort to remove and take apart a door panel, it is worth your while to purchase and install an entire Mercury window regulator set.