Weep holes on sliders can be seen in the sill track.
Air holes in window frames.
The purpose of a window s weep hole is to drain water away from the window keeping the water out of the building and protecting the window sill.
Also found this kit may be this will be an alternative option.
Drilling a pair of 1 4 holes through the aluminum storm window frame bottom vertical edge working from outside the window or inside if you re on a higher floor make each hole about 4 in from the sides of the storm window.
Found at the bottom of storm window frames these little holes must be kept clear to function properly.
In our photo the sill needs painting but the weep hole is working properly despite the owner applied caulk.
If the pulled down window is holding the ac in i would not drill holes in the frame.
Cut them a tad longer than that measurement and place them into both corners of that space.
You could try vinyl plugs that can be found in hardware home improvement stores.
If there isn t one for the hole s size you may have to drill it larger to the size of the plug so that it will fit.
Increase the velocity of air crossing a gap say between a window frame and adjoining siding and you ll hear that whistle or an all out howling depending on the direction and speed of the wind.
The exterior weep holes that drain the water out of the window are not aligned with the interior weep holes.
Weep holes in windows keep water out of your house.
Window maintenance and debris free weep holes most sliders have weep holes as do most double hung replacement windows.