Evo Iv

[car maniac]

help !!!! i have got problems with the rear doors' windows , if i hold up the knob to raise up the windows it will go down , another words it will not stay up and closed, it will just go down and stay open just a little bit, like something in the way therefore windows go down, actually nothing blocking the way !!!!
what should i do with it !!! anybody helps will be greatly appriciate it.