Bodyshell and Panels; Fittings; Dashboards; Interiors; Bumpers; Light clusters front and rear (non electrical queries) Grilles and brightwork; Repairs including to bulkhead due to clutch cable pulling through
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Blocked drain outlets from decayed leaves, etc, are I think the most common source of leaks into the dashboard area of most cars. So the first thing I would check is that the plenum chamber water outlets are clear. There is one at each end of the chamber which takes water into the wheel arch:
Plemum chamber rain outlet.jpg
Then I would check there are no holes in the flexible cover diverting water into the wrong part of the chamber. I would also remove the cover to check there is no sludge build up stopping water from flowing freely from one side to the other. You will then also be able to check the condition of the grommets and seals.
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Last edited by GT_II on Wed Apr 12, 2023 3:29 pm, edited 1 time in total.
1992 VW Scirocco GT II 1.8 90PS Brilliant Black 30k
Thanks for the information. We've only checked the plastic rain cover and there is a crack in it.. Will check the plenum chambers tonight if this weather ever gives up! It also has a sunroof which is another place we can check... Thought we were having a good run on the car..
Corrosion or badly fitting rubber seal in the bottom corners of the windscreen can allow water in. On the passenger side it often goes via the fuse box which can be bad news.
That’s a great video thanks [emoji4]. We did all the tests and then the boy noticed a huge round hole in the engine bulkhead with a cable going through. The grommet has split.
Speedo cable I think. Yes deffo speed cable. The car goes in for a cam belt change next week so I will get our guy to change the grommet whilst he's working in the engine bay.
The actual grommet had slipped off the cable exposing a nice round hole in the engine bulkhead. The boy had his cam belt changed this week and the mechanic popped it back in for him.
Thought we’d cracked it but unfortunately it’s still leaking. Need to plug the leak as the boy has ordered all new soundproofing to go under the carpets.
So I’m going to put a small amount of silicone on the right corner of the main window seal because I’m stumped where it’s coming from.
It’s not the sunroof or plenum chamber as they drain freely.
If it's a significant amount of water, I still think the plenum chamber is the likely culprit, as it is effectively the storm drain for the front half of the car. Have you checked water is not running through the heater fan housing, eg due to a crack in the rain tray or due to missing or failed rubber bushes around the fixing screws?
From the dreadnought customs video, it looks like any seepage past the windscreen seal should drain through to the plenum chamber via drain holes under the seal at either end of the scuttle panel, although I guess hidden rust in this area could cause a leak.
1992 VW Scirocco GT II 1.8 90PS Brilliant Black 30k
I would go for a new windscreen rubber and take it from there. I had a similar problem and dicked around for donkeys. Ordered new Windscreen rubber from VW classic and eventually after a while, got a guy to install it as most window fitters either refused, as it was too OLD SCHOOL and required work!! Bigger companies were looking silly money even though I was supplying the actual rubber. New window rubber and the leaks stopped. What threw me was that the leak was always behind the front seat and I thought the leak was coming somewhere from the rear. Just remember the age of the car and the age of the rubber.
