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Water Ingress Passenger Side Pollen Filter

16K views 25 replies 5 participants last post by  richard-cranium  
#1 · (Edited by Moderator)
So for the first time since I got the car there is an inch of water in the passenger foot well.

Read a few posts stating the pollen filter housing seal disintegrates over time, so thought I'd have a look and take pics while at it.

First off torx driver for the plastic trim/grill assembly vent that screws to the body and clips to the bottom of the windscreen.

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Leave the wipers in the up position to make things easier. If the grill assembly hasn't been off before it will be well gunged in position so might be an idea to remove the wipers from their splined shafts.

Remove the centre steel piece with 1 x torx screw dead centre.

Then remove 2 x torx screws from each half of the grill assemblies.

I only removed the one side (passenger)

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Take care removing not to kink or fold/bend the hard plastic strip that clips to the bottom of the screen and to the grill/assembly cos it is in one piece across the windscreen.

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The plastic grill has a rubber seal bonded to it where the plastic strip clips.

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Exposed Pollen filter

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Now remove the filter and the filter housing. One nut (13mm a/f) is outside the housing the other inside. The wiring loom is clipped to the housing and the weight tends to pull the housing down and away from its top sealing face.

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Once the housing is removed the seal area can be seen. This one was split and broken and didn't resist the housing being moved off the bulkhead.

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The amount of "soil" (decomposed organic stuff like leaves etc) and crap in the gutter beneath the wiring loom was causing the level of water to rise above the heater air intake grill.

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Cleaned out...

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Clean all the remains of the foam seal away and dry.

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Clean the back of the housing seal face. I used bathroom sealant as that's what I had and it's waterproof.

Apply very very thick bead to both mating faces as the housing isn't very rigid and bowed slightly without foam to take the gap. Double sided double glazing window tape might work but would need to be a couple of strips thick and that stuff sticks first time so not much room for error.

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Screw the housing up ensuring sealant squidges out. Wipe off excess. Fit filter and clip harness back trying to keep as much weight off the housing as poss.

Clean the plstic strip grooves and push back onto the bottom of the screen.

Clean the grill seal and clip back on ensuring it has located in the plastic groove all the way along.

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No way water is coming in through there again!
 
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Discussion starter · #5 ·
Heres the stick hahahahaha.

The method used here to get to the pollen filter is one of the main reason for getting the problem the thread is about :)
Do you think the sealing strip along the window stops all from getting through? I changed my pollen filter every other year for 14 years on my last one like this and that never leaked. Must have been lucky!
 
Discussion starter · #9 ·
Heres the stick hahahahaha.
The method used here to get to the pollen filter is one of the main reason for getting the problem the thread is about :)
Do you think the sealing strip along the window stops all from getting through? I changed my pollen filter every other year for 14 years on my last one like this and that never leaked. Must have been lucky!
The windscreen strip has always sealed on mine, its just the strip with no sealer and i use a pressure washer on the area at least once a week.
The 'stick' was for only removing one side of the cowl trims instead of both as that means only one side has been cleaned/re sealed.
Maybe you have been lucky :)
Over the period you mention ive lost count of the number of people with leaks after just removing one of the trims. How was the water getting to the area you sealed with sealant around the pollen filter?
The water was building up from the "birds nest" at the end of the gully allowing the level to get above the bottom of the filter opening.
 
Well the water is back over the last few years!

Started pulling the carpet and underlay back and the water is sitting in the floor channels half an inch deep.

I can see the run of water coming down the inner skin forward of the passenger door, so I know it's not running down the door skin.

Underneath the fan air intake is bone dry so this isn't getting through the pollen filter opening through the bulkhead.

Could this be the windscreen seal in the corner?

The car is solid and no rot anywhere on the bodywork. Suppose I will need to remove all the flooring/bulkhead covering material to see from the inside where it is getting in.

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Discussion starter · #18 ·
Discussion starter · #19 ·
Just had the endoscope up towards the top of the arch from under the dash, behind the glovebox/fuse board.

Can see where the water is getting in!

The end of the mastic from the foam join.

Looks like it's coming in along the foam strip but more at the end where the mastic stops as you can see the dirt/foam bits that have washed down over the cream mastic!

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Discussion starter · #21 ·
Using my ÂŁ5 android long lead endoscope I got some excellent video showing down the water channel from scuttle plate down to pavement!

Got some photos too.

Looks like I can see a seam not sealed near the top about 500-600mm from the car floor. Not sure exactly where it is yet but also found the drain channel hole through a horizontal brace totally blocked with crud and leaves. Once I managed to clear that with a hook on the endoscope I could push the camera right down to the pavement. Then I videoed. After that I put a hose down and flushed it out.

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Here you can see through to the pavement!

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Discussion starter · #22 ·
Video from pavement to windscreen.

God knows what's living in there @0.15s

Looks like trim loose at 0.44s. Camera snagged so had to spin to get out and lost orientation.

The top part is dirty where it was blocked.

"https://www.youtube.com/embed/XNDA-iN50cs"
 
The areas you show mondy Z are well sealed on mine, but is running down that from above. It is coming in at the top of the inner where I cannot get to. Thought clearing the water channel might stop water building up and seeping through, I had a hose pipe running from the scuttle for 10 mins with no ingress.

Think is is getting in the vertical seam between the outer wing and car bulkhead near the top below and behind the bonnet hinges. The video shows a vertical seam not sealed all the way along its length, so might be that.

Gonna clean as much as poss and get the cavity wax sealant and long nozzle and try that.
 
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Cleaned out and cavity wax with long nozzle along the top of the channel below window/under filter and behind hinges and down the verticals in February and had many a heavy downpour since and now bone dry! :banana: :banana:

until next time!
 
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