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So, I took on Project GT TDi, a Mark 5 Golf which has it's very own river in the front. Some say that ducks can be found bathing in the foot wells of the car, all we know is that if it doesn't leak then it's not a VW.

It comes as no surprise as 100% of VW's I've owned have all leaked, some in similar ways.

So, this Golf is a 5 door, no sunroof. The water appears to originate up behind the dash. The foam sound deadening behind the dash is soaking and dripping wet on both sides. Apart from taking the dashboard out, I've not worked out how to remove the deadening under the dash to dry it out.

I've removed the scuttle panel to see how water can get behind the dash, the usual suspects, bonnet release grommet, access panel and on the passenger side the cabin air inlet vent. Under the scuttle panel it doesn't appear wet around these areas, though the pollen filter housing is where my MK4 was wet on the passenger side.

Photo, shows the drivers footwell, it's soaking far left and far right. Far right, bonnet release leak? Far left, water coming into the air ducting perhaps from the blower air inlet?

The white stuff is talc which helped me trace the flow of water.

So, have any MK5 owners here had a similar leak with similar lines of diagnosis and fix?

Thanks.
 

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Discussion Starter · #4 ·
Here's what the Golf looks like today.

First photo, passenger side, then the rest are drivers side.

Red arrows (love those jets) shows where the water runs down on the drivers side.
 

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Discussion Starter · #5 ·
Water is coming in through the entire front by the looks of things, water is coming out of the relays and OBD port.

I'm wondering, can the windscreen leak from the bottom?
 

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Discussion Starter · #6 ·
No interest here, but forums are quiet these days.

Next job, dash is coming out.
 

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I think you're making the right move pulling the dash, it'll (hopefully) save a lot of guess work.

Pig of a job but it'll mean you'll be able to see where the rain comes in.

Good luck to you, hope you find the leak.
 

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Discussion Starter · #8 ·
I think you're making the right move pulling the dash, it'll (hopefully) save a lot of guess work.

Pig of a job but it'll mean you'll be able to see where the rain comes in.

Good luck to you, hope you find the leak.
I've got lots to do, lots to remove

  • Steering wheel and airbag
  • Instrument cluster
  • Radio
  • Air conditioning controls
  • Headlight switch
  • Clock spring air bag
  • Indicator and wiper stalks
  • Various control modules
 

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Discussion Starter · #9 ·
I'm having a tough time at the moment. Main car has decided to go and fuck itself, leaving me with no working car.

I'm going to see how I can get this Golf on the road asap, but the amount of water coming in is concerning, the relay box is soaking, water coming through the relays and the throttle pedal plug.

I really don't know what to do.
 

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Sorry I can't help as my 07 Mk5 1.9tdi hasn't suffered from the problem at all. Had it 9.5 years and it's been dry as a bone inside it bar the well known window condensation issue

Sent from my PRA-LX1 using Tapatalk
 

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I'm having a tough time at the moment. Main car has decided to go and flip itself, leaving me with no working car.

I'm going to see how I can get this Golf on the road asap, but the amount of water coming in is concerning, the relay box is soaking, water coming through the relays and the throttle pedal plug.

I really don't know what to do.
Maybe the Golf wants to be a Polo instead, like the mint, with a hole in it.

But in all seriousness, as a crude test you could get some mastic and put it around every grommet visible under the scuttle panel. It might get messy if that doesn't resolve it thought. And maybe a bead around the edge of the windscreen glass, or maybe a new windscreen under your insurance (could be expensive excess just to try it though, even more annoying if it doesn't sort it).

Where the relay box is wet, I'd be thinking windscreen, I'm not sure what else is high up enough to leak onto it. Unless maybe the grommet for the heater matrix pipes is leaking, but I'd assume that wouldn't reach out as far as the relay box.
 

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Discussion Starter · #12 ·
Yeah I've run sealant around the bottom of the window where it meets the trim and scuttle, sounds drastic! So there's the bare minimum in the car at the moment just to get it working whilst the other car decides it wants attention.

Whilst most of the underneath of the dash was out, the relay box was hanging low, so water managed to track its way into one of the relays, which I sorted out, so with it back in place it should be fine.

What a mess! But that's Golf owner ship for you.
 

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Discussion Starter · #13 ·
Here's something very bizzare.........

I noticed the sound of swishing water, then took a look and could see the hole (red arrow) inside the inner skin, FULL of water. So water is filling up between the outside metal skin and the inside. It then seeps out via the (yellow arrow) lip where the inner skin joins.

Then as I'm driving it's all swishing around and making its way out...........

Similar on the drivers side.

How the hell is between the skins filling up with water?

:huh:
 

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Discussion Starter · #14 ·
We had quite a downpour yesterday. And today. The car is literally swimming with water. Still no idea how it's getting in.
 

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I don't know if this is of any help as I have a Mk4 (Bora) but when I bought the car and first washed it I was shocked to find water pooring off the fusebox and relays in the driver's side footwell. My driveway is very steep so that was a contributory factor (I had parked the car pointing uphill) but the ultimate cause was the large rubber grommet in the scuttle panel. I sealed it with mastic and the problem was sorted.

Another issue I had with the previous Bora was a blocked AC drain - this caused water to collect in the passenger footwell. Easily cleaned and fixed.

Has your windscreen ever been replaced? Is it worth taking it to a windscreen repair place to get them to have a look (for some beer tokens)?
 

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what was it in the end? I've got a leak in mine I need to find. The rubber bung under the scuttle is a good shout!
 
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