[laughterjones]

I've provided two images, one for showing scale. The other to show where my question lies.

I'm having significant cold air infiltration on the right hand side of that picture where the window slides up and down. It has this tube-like, moveable piece which I think guides the window? Not quite sure.

Anyway, the cold air is rising up through this track.

Am I able to put some expanding foam down through this track? I'm afraid it will make it stick completely, as we do use the windows during spring/fall.

Or is there another solution for this? Right now I have a piece of cut cloth on one of the windows where it is real bad. We can't replace them at the moment, but this cold air is too much. Thanks.

 

[Windows on Wash]

No.

Look for some foam wedges that you can put in. They are call chimney blockers by most window companies.

 

[laughterjones]

Your chimney blocker comment made the following keyword search bring up:

http://www.diychatroom.com/f104/repairing-vinyl-window-seals-192778/

You also replied to that comment, your coherent solution is commendable. Should I just tilt the window back and cut to fit for the channel size?

 

[joecaption]

Try to move that sash from side to side.
There should be very little side to side movement.
If there is the window may not have been shimmed properly
Some have an adjustment screw in the center of the jamb.

 

[dd57chevy]

What W on W said ! Especially if this window is under a "wind load" . If you don't have access to scrap foam , you could buy a roll of appropriate size/width foam weatherstrip & cut a piece to fit . Put it inside the bottom of the jam opening .

 

[Windows on Wash]

Your chimney blocker comment made the following keyword search bring up:

http://www.diychatroom.com/f104/repairing-vinyl-window-seals-192778/

You also replied to that comment, your coherent solution is commendable. Should I just tilt the window back and cut to fit for the channel size?

Thanks dd.

Put the foam here (see pic).