97 blazer rear window help

Got a 1997 4dr 4x4 Ls. the problem is the rear window when driving around the rear window makes all kinds of noises like its loose i checked the window and seem to be a little loose. Is there a way to adjust the rear latch so the window will be a tighter close and not make noises. i remember a 98 blazer i had and seem to have the same problem. I checked the rear latch and could not find a way that the latch can be adjusted so the window would be tighter, i might be wrong. any suggestions?

thanks