Check the area in the engine compartment just under the windshield - see
if any holes through firewall (wires, cables, etc.) that may have become
loose or missing grommets. Large amount of rain in this trough can get
into passenger compartment and down firewall if any through holes are
here is a question does the car have a post around the window if it
does not look at the top of the window and see if it is closing in to
the weather strip if not that is where it is coming from it happens to
me all the time just push on the top of the window and it will stop
but you have to do it all the time or replace the bottom window track.
on that side it is more then likely it is broke
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