Do you have air con? If so there is a little rubber Zed shaped overflow tube that exits the bulkhead in the passenger's footwell. This may have got blocked. Reach up in behind the left front wheel and you will find about half an inch of the tube protruding out from the bulkhead. Squeeze the sides of this with your fingers and it might pour out some water after the small slit is freed up. Then get a hose and spray water into the vent in front of the windscreen. It should now flow out the overflow tube freely.

 

I suspect it will be the seal around the heater intake more than anything, but could also be around the window/door seal. have you ever noticed water or the stains from it running down the inside from where the door mirror mount is?

 

You'd be surprised where water can get to. Passenger Side leaks can be from the door seal (but I find only the floor behind the seat gets wet), from the wing mirror (but there be stains down the door card) or the air intake.

I'm no expert, but I do speak from experience as I have all three (hopefully by the end of winter it will be 'had' all three ).

As for the 'Air Intake', would you believe that it runs in from the vent on the left just infront of the windscreen, goes through the wimpish foam seal that is suposed to keep it inside of the plastic air pipe, runs down the outside of the pipe into the passenger side of the car and drips off the bottom just behind the glove box as the pipe turns right towards the centre console.

Run some water over your front window, leave for a few minutes, crawl under the glovebox and feel the underside of the pipe. I couldn't believe how wet it had got!

If it is wet, then off the glove box must come. Though, I do have a question for the more informed fellow forumees: once the leak is fixed, where does the water go instead?

Good luck chasing it down

 

There is a very minor leak from the wing mirror, but I know what to look for and it happens only once in a blue moon.

Looks like a more thorough investigation is required.

Thanks chaps

 

I had two other leaks into the passenger foot well.

One was after I had the windscreen replaced and the water was entering above the rear view mirror, running round the inside of the window surround and dripping down the back of the glove box.

The other was a missing blank in the floor pan. Don't think much could have come in there, but you never know.

Water finds weird route to the footwell.....