Have a read of this, it seems quite a common problem:
www.fordownersclub.com/forums/topic/8762-fiesta-mk.../
Page 5 onwards seems to be relevant, the poster Lewie226 seems to have sorted it.
I had exactly the same problem on my old Focus. The current weather is not ideal, you really want a nice dry day then get a wide-bladed strong screwdriver and prise up the roof trim (it will be well glued down), clean up the area exposed which will be filthy and pump in some roof/gutter mastic, which will also be sticky enough to keep the trim in place.
It seems Ford never learn how to make a car waterproof. My brother had a 1981 Escort back in the day that leaked. My Focus leaked, neighbour's MK3 leaks in the boot although that's a different fix that needs the bumper removed.
Edited by Xileno on 08/01/2022 at 18:50
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