Unfortunately stains on the top of the window frame are more likely to indicate a leak within the walls of your home.
Window siding leak.
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This does not make it a correct installation however.
Vinyl siding is designed as an exterior cladding only and is supposed to be installed over other materials such as a weather resistant barrier.
When you see water between the panes it is usually a sign of a bad glass seal.
A glass seal is designed to maintain a layer of gas between in the indoor and outdoor panes of your window.
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Inspect the area above the leak including both indoors and out.
If your window is leaking around the top of the frame you may not actually be experiencing a window leak at all.
Any water which hits the wall above the window rolls down the siding panels into the top j.
The window is unlikely to develop an indoor leak anytime soon even though it looks like the panes are leaking.
Another truth water hits your building s j channel then goes down and goes between the metal siding and window wrap tyvec and out the bottom.
There s truth as to why you are getting leakage around your windows drum roll please poor installation.
The presence of a housewrap on modern buildings or felt on older buildings combined with proper flashing at windows doors and other openings are relied upon to keep water from entering the structure itself.
While gaps and openings permit leaks behind the siding some siding openings are normal such as aluminum or vinyl siding bottom edge vents.
In this video this old house general contractor tom silva shows how to prevent water from leaking in behind vinyl siding.
Pull off all peeling and loose caulk and wash the window with a detergent solution to.
The water will go left or right to the side j s and then out the bottom.
Vinyl is a potentially leaky material and water trapped behind siding leads to decay and mold.
Many homeowners see water stains near the windows and automatically assume that the glass itself must be leaking.
It is at the lower corners of the window where the potential for a leak occurs.
Check to be sure weep holes are open along bottom of window openings.