Hi all,

I'm hoping some of you Mk3 experts can help. I have a 2016 Octavia III vRS with the 2.0 engine, and my windows fog up on the inside really badly, but only after about 20 minutes of driving or longer. The first 20 minutes are fine.

What I've already checked:

- Plenum chamber drains under the windscreen (clear)

- Boot seals and boot floor (no sign of water)

- No obvious wet carpets in the footwells

What I'm planning to check or have done:

- Cabin/pollen filter condition

- AC compressor running and recirculation off

- AC evaporator drain

- Hidden damp under carpets or mats

Has anyone had this on their vRS and found the cause? Any hidden leak spots or known faults I should look at, like the heater matrix or scuttle seals? Happy to post photos if useful.

Thanks in advance!

Apparently after reading through a few other people's issues, there is a common problem with the passenger side door retaining water in the bottom as the drain hole gets blocked.

Worth having a look ?

Thanks, will check it tomorrow morning. Ill let you know 👍👍

could be water in underfelt. Check your coolant level in case its coming from heater matrix. Also check around spare wheel. Had water in there due to a grommet being missing.

Alasdair