i took the plastic cover off the f.passanger door...do i need to put a new plastic cover....if i dont what happens?

 

are you talking about the liner between the door and door panel? If so, its just a moisture barrier. I know that my front 2 doors on my eg sedan dont have them. i'll be putting new ones on once i get the $ to.

 

yeah the little thin paper Sh*t .....evry time when i put my door panel back on..my window decides when to go up or down ..then when i take the panel off the window goes up and down well..ive changed the window motor and switch is ok