Try a silicone lubricant.
buy a new window
usually by replacing window regulator.
change the window seal / gasket.
you need to replace the window regulator
You can purchase a repair car window kit that has the instructions on how to fix your crack. If you have insurance however, I would recommend getting a repair shop to fix it since it is covered on your isnurance.
you'll need to put in new bushings
Hold down the child lock when you press the button to raise the window.
No
If its an automatic window, then the motors may be about shot. If its a manual window, have the tracking checked, it may be slipping off track.
Either replace the belt, or go down to an auto store and purchase some belt dressing.
that car has issues with the windows and VW knows about it! Call your local VW dealer and ask if they will fix it for free! they would fix all of them for free awhile back regardless of the milage on the car!
Do NOT pour hot water on a frozen car door, your window will definitely not make it! Cold window in frozen car door+hot water=broken window. Try taking your ice scraper and actually prying the door along the seal to get it to pop open.