Your Hummer takes a lot of wear and tear - and moving parts like your Hummer window regulator will feel the stress from all that off-road driving that you do. The Hummer window regulator parts can deteriorate because of the stress of dirt, extreme temperatures and moisture. Eventually, one of the parts in the Hummer window regulator will break down or crack because of the loss of lubrication and the constant use. When a regulator fails, the motor and fuses that power the window might fail as well. You can take on the task of ordering a new Hummer window regulator from our site. That's the easy part - the hardest part is taking apart the door panel, then reassembling it. To do that, first remove the lower and upper door trim panels. You also need to unplug any wires leading to accessories like the power window switches, power door locks and remote mirror controls and stereo speakers or amps. Then, peel back the seal. One hint: map out or mark the position of all the components of the door panel before removing them. There are some special tools to help you pry open the panel, but most of the work can be done with the basic tool set you probably own already. Be very careful of the spring and lever mechanisms - they are extremely powerful and you can easily lose a digit with these components. After you complete the installation of your Hummer window regulator, lubricate the parts with a silicon lubricant.