Window wont close??

cheesyquaver

Seat Ibiza Gti 16v 2.0l
Nov 11, 2010
103
0
Germany
For some reason the passenger window wont go up. Well not all the way anyhow. It struggles and then stops about 1cm from the top and then i need to pull it. Im hoping to god i dont need a new motor! Maybe just the belt slipping?