A contractor just finished installing flooring and new carpet in our coach. I did the tearout work. I found signs of an inactive leak on the driver's side footwell, and of an active leak on the passenger-side footwell.
I won't go through the whole story, but the active leak was not coming from the very wet window track. Instead, it appears to have leaked at the roof-wall-cap joint. This seems to be a common leak source for Monacos of my coach's era.
The diagnosis, joint repair and floor repair took a big bite out of my Summer.
Just letting you know you may be in for more work than a window seal repair.
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport