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I hear a crackling noise when I put the passenger front window up. It crackles once or twice ever-so-slightly when it rests in the closed position.. I think I have heard this noise before right befor I got the Pop-N'-Drop on my other windows..
Question is,
Do I do preventative maintenance and fix it BEFORE it pops, or leave it and hope it doesn't pop, It will most likely pop at the worst time/location... I don't know..

Never had this problem myself, but my Dad had the same thing on the drivers side window on his Avalanche. I can't remember what the problem was exactly, but I know he had to have it fixed. Something with the arm mechanism, it was a cheap fix at the dealer if I remember right.