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I'm thinking that the window was partially down, and your door was closed very hard. (slammed closed) This will commonly cause your window to jump out of its track. With the window out of its track, it will make the window hard to roll up, overheating your motor and causing it to thorow its safety switch, (to prevent window from busting) This will usually reset itself in 1-2 min. The window will go down easier, due to the fact the the window is helped down by the force of gravity, or it is not fully in the track at this point, so there is less friction against the window. Roll the window down as far as it will go, spread the felt weatherstripping where window seals to the door, and use a flashlight and see if you can spot the track that the window has jumped from. Sometimes you can force (but be carfull) the window back into its track, othertimes you have to remove the door panel to guide the window back in place. Your window is definatly off track or you have a very weak window motor.
The glass for your window sits on a metal bar on the window regulator assembly. The bar is raised by scissor like lifts run by a motor. If it falls forward the rear portion may have come off from the bar and the guides at the rear may have kept it from lower along with the side that is still attached. You will have to open the door panel to gain access to it. Inspect also the guide for dirt or it may need replacing, it could have caused the part of the window to come of.
Below is a sample of what the assembly would look like:
If you can hear the motor running while pressing the window switch you may have a broken clip or something in the way causing the window to slip off track. If no sound comes while pressing the window button you may need a power window regulator motor "OR" the window button itself may need replacing. If the window was down when it stopped working and had to be manually rolled back up, this can cause the glass to randomly fall back inside the door. This is because the car thinks that the window is still down and will continue to fall until it tells the computer that the window was closed using the power window button. If the window falls at just the wrong angle you could end up having to replace the glass as well.
It probably did not fall off. There is a plastic piece on the regulator that can break if in a bind. When this happens, the window just falls into the door. You need a new regulator/motor assembly for the door this happend on. Dealer is expencive. Napa will have it for $120.
probably worn out regulator,especially if you haer the motor when you press the button,try various nissan wreckers it should be $100 maybe $200 but thats it labour should be 1 to 2 hrs depends on mechanic,definately window reg problem
When the window falls down it is because the cable for the regulator and motor broke. The only fix is a new regulator/motor assembly from the dealership, or a good one from the junk yard if you can find one.