Re: Hard to slide side windows.
Reply #2 –
Here is my suggestion. It addresses two potential problems in one swell foop.
Remove the windows, install new gaskets and when you reinstall the windows, DO NOT over tighten the screws that hold the inner frame to the outer. This will allow the windows to slide easier. I think if you just loosen the screws without replacing the gasket, you will end up with a bad seal.
The window has round corners and the hole in the wall is square. Over time, the gasket compresses, shrinks in length and pulls back at the corners. You can check to see how much they have shrunk by using a very thin putty knife or feeler gauge at the corners. It should not slide in more than about an 1/4 of an inch. Compare it to the flat sides.
I found several of mine had pulled back enough that they no longer sealed the corners. It took me about 90-120 minutes to remove, prep and reinstall with a new gasket. You can buy the gasket from Xtreme by the foot.
Hope this helps,
Rich