It sounds like everything is working but there's too much resistance. When it moves hard, the motor will draw excessive current and cause the thermal cutout inside the motor, (if there is one), to break the circuit. It will reset when it cools down in a minute or two. Most cars also use an auto-resetting circuit breaker instead of a fuse because it's considered a safety system. Whereas a blown fuse would leave the system dead, an auto-resetting circuit breaker will let you have another shot at rolling down one of the windows.
Three things come to mind to check. The first one is physical resistance between the window glass and the rubber channels it rides in. Bug juice and other gooey stuff will make the glass hard to move. Spray both channels liberally with Silicone Spray Lube. It goes on like water, then evaporates and leaves a bunch of "slippery" behind. It works real well for sliding rubber hoses onto metal pipes too. You can find this product at any Chrysler dealer's parts department or most auto parts stores.
Most window regulators today consist of cables and cheap plastic pulleys. The wires fray and the pulleys crack. No surprise there. Any idiot, other than the guys designing cars, would know to expect failures. You might be able to look inside the window opening when the glass is down to see or hear if wires are wrapped up, twisted, or frayed. If everything is relatively quiet, the regulator is probably okay.
If there's a thermal cutout inside the motor, the contacts could be pitted or arced. GM has a lot of trouble with their truck window motors. The thermal cutouts develop electrical resistance between their contacts which reduces current flow and reduces the motor's power. Anything else that increases circuit resistance will also cause the motor to lose power. That includes pitted contacts in the window switch or relay, and frayed wires between the door hinges. A problem with the window switch will affect just that one window. Frayed wires can affect all of the windows, depending on which one is about to break.
Thursday, August 25th, 2011 AT 8:19 AM