Most low tech ways would be to Mix some soapy water, spread it on a suspected area, then blow with compressed air from the inside and see if it starts bubbling up, if not, try somewhere else. Repeat until found.
Alternatively disassemble stuff in the suspected area, then pour water on your car and see where it enters…
Once done, dry it out and replace whatever seals are broken or run a line of window adhesive or such, along the area that it enters.
While at it, prevent potential future headaches by checking that the car isn’t completely full of leaves and crap under the cowling in front of the windscreen, (under the window washer arms) some cars will start letting water in if that happens. Also check that the front fenders haven’t filled up with crap near the doors, just take off that section of the inner wheel cover and empty it out.
Seen quite a few cars with either of those happening or on fords from around 2010-2015 in particular, the sealer near the trunk hinges starts drying out and cracking. Despite us not even getting much sun here in Denmark.
SmacksWaschbaer
In some audis the washer fluid lines run through this a-pillar. Could be that maybe?
BitterTexas
Focus usually leaks along the seam on the roof.
Ibuilds
Also check the windshield. If it wasn’t installed perfectly this can happen. Same issue on my old car. Couldn’t figure it out, eventually traced it to the windshield. Got it replaced by a reputable shop and no more leaks.
![[Fiat 600] located in the Bay Area, CA](https://www.evshift.com/wp-content/uploads/2026/01/x13hxb2gytdg1-770x515.jpg "[Fiat 600] located in the Bay Area, CA")
![Never know what you’ll find here! [multi]](https://www.evshift.com/wp-content/uploads/2026/01/egrp3iivzsdg1-770x515.jpg "Never know what you’ll find here! [multi]")
6 Comments
Is there a sunroof?
Step 1: find the leak
Step 2: fix it
Find the leak.
Most low tech ways would be to Mix some soapy water, spread it on a suspected area, then blow with compressed air from the inside and see if it starts bubbling up, if not, try somewhere else. Repeat until found.
Alternatively disassemble stuff in the suspected area, then pour water on your car and see where it enters…
Once done, dry it out and replace whatever seals are broken or run a line of window adhesive or such, along the area that it enters.
While at it, prevent potential future headaches by checking that the car isn’t completely full of leaves and crap under the cowling in front of the windscreen, (under the window washer arms) some cars will start letting water in if that happens. Also check that the front fenders haven’t filled up with crap near the doors, just take off that section of the inner wheel cover and empty it out.
Seen quite a few cars with either of those happening or on fords from around 2010-2015 in particular, the sealer near the trunk hinges starts drying out and cracking. Despite us not even getting much sun here in Denmark.
In some audis the washer fluid lines run through this a-pillar. Could be that maybe?
Focus usually leaks along the seam on the roof.
Also check the windshield. If it wasn’t installed perfectly this can happen. Same issue on my old car. Couldn’t figure it out, eventually traced it to the windshield. Got it replaced by a reputable shop and no more leaks.