I had a similar problem with my Mk 7 Fiesta though it was also in the drivers foot-well too, it turned out to be the weld below and to the left, as you view from the front, of the windscreen, weld is visible when the bonnet is open.
tried everything to prove where the leak was coming from with no joy so it had to go to a dealership with the equipment to do so. All in all total cost was over £600.
Posted on Wednesday 29th of March 2017Don't understand this? Ask a question