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Water Leak through Pollen Filter

169K views 87 replies 50 participants last post by  lilFishy  
#1 ·
Over here the the Northeast, we have heavy rains. Checked under the carpet on my passanger side and saw water leaking in. I have a 2002 Passat. Out of warranty of coarse. I know this is a known issue, but how do i go along fixing this problem?
 
#2 ·
You want to try to determine if the water came in through the filter media itself, or if it seeped under the plastic housing that holds the filter.

This housing has a crappy foam seal that on 2001.5 and 2002 models, doesn't seal well.

I bet that is what is wrong with yours.

Take the filter out, take what the filter was sitting in off, and reseal it. You could use generic weatherstripping, RTV silicone, whatever.
 
#5 ·
Same thing happened to my car.Rear passenger floor wet.I have a 2002 also.How do you take the pollen filter shelf out.There are 2 screws that i see.1 on the side and 1 inside under the pollen filter.I took both out still can't get the shelf out though.Under the shelf the foam gasket was soak and wet though.This must be the problem.
 
#8 ·
Paul, there are 3 screws in my 02 passat. I was able to take them out, BUT there is some handle over the filter that can only be removed by taking the guard attached to the windshields.. I didn't even bother.... I just tried to seal it with so impression mold... lets hope it works...

You should just unscrew the 3 nuts, and use some kind of sealent to seal it
 
#9 ·
here is my little guide to how to fix it... hope it helps..i acutually fixed this a year and a half ago so that is why i didnt show completley, but you will most likley under stand what you need to do..

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^apply some silicon carefully on the edge of the plastic and you windshield. This seems to be the area where the water most likely comes in through. You can get rid of the excess silicon when it dries by running along the windshield with a razor blade..

once again hope it helped..
 
#11 ·
Aagiants said:
How do u get the whole housing out? There was a handle on top of it which restricted me from taking it out.

:)
That's not a handle; believe it or not it's a gutter to prevent water dropping straight on top of the pollen filter, it has to be one of the most cack designs on any motor car, ever.

It can be removed without taking off the skirt at the base of the windscreen cos I've done it, but it's not easy. It's fairly flexible and it is possible to pull the sides out first and then manouevre the thing out with a lot of brute force and ignorance, getting it back is even more fun, but do-able.
 
#12 ·
I broke the f***ing skirt.I got the housing out though.Put silicone all around the housing and no more leaks.There was a bunch of leaves behind the housing which i think was causing the leaks.the water i think was building up.Anyway i have to glue together the skirt now really can't notice it but i know its there.
 
#13 ·
This was likely the cause of my control module failure a year ago. This is the unit under the driver-seat floor. Water seeped in and shorted out various connections. Front passenger window would open all by itself. The alarm went off once after I started the car (no I didn't accidentally touch the key-fob panic button!). Back door locks would click away randomly. When they finally isolated the problem and went to remove the floor carpeting to get at the module unit, there was a quart of watre trapped under the carpet. Since the module was replaced, everything has been fine. HOWEVER, lately I have heard swishing water in the top-dash area sometimes when I dive off first thing in the morning, which is likely water (from overnight condensation) in the air cleaner unit -- what do you think? Horrible though that it might happen all over again...
 
#17 · (Edited)
How much do these Comfort Control Modules cost?...

I've got a 2.3 VR5 Saloon that I recently bought in an auction (first registered in 2000)

Problem 1: Electric windows, remote central locking, interior light, door mirrors not working (not sure if anything else is not working). There is a puddle underneath the battery tray so I presume this is the problem.
Once I've cleared the water - is this a common enough problem that I wont be able to find a Comfort Control Module in a scrap yard?

Problem 2: Looked for a Haynes manual and this model is not covered in any publications, can anyone advise where I can get a manual?

Any advise would be welcome
Cheers
 
#18 · (Edited)
Blockage cleared, a couple of gallons of water flowed all over my driveway, and after lifting the carpet a little I've found water (obviously dried-out by the previous owner prior to sale).

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Battery removed - about 1 1/2 inches of water lapping around my socket!

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I recommend wiping the offending area with old engine oil, it's free, keeps the water running freely, gets leaves to stick to it and prevents rust.

>>>Thanks to Wierd little biscuit for the guide<<<

If anyone else has this problem - I'll update when finished as to costs etc.
 
#21 ·
I have the same problem with a 2004 passat, I think water has been leaking in steadily ever since I bought the car, not enough to take out the control unit which I've read about here but the carpet in the rear passenger footwell is soaked and over the winter I have some strange intermittent electrical faults especially with the satnav/cd. It seems in my model that removing the battery is little more tricky than in the guide I got from weird little biscuit, looks like the plastic between the screen and hood has to come off and therefore the wipers too. I really can't believe this sort of design fault has been allowed to continue into newer models. In theory my car should still be covered by the 2 year factory warranty but I'm not sure if it'll cover this. I'm not hopeful.
 
#22 ·
I just remembered that last November I had that piece of plastic that runs along the lower edge of the screen replaced because it had a crack in it - maybe this has something to do with it.
Just as a matter of interest, if the drain holes under the battery are blocked how does the water get into the car? I can see how it gets in via the pollen filter route. thanks
 
#23 ·
Nomlad, the 02' passat has the same plastic piece in the way... you just have to manuever the battery a lot to get it out... (which is hard since its soo heavy)...

and, Not exactly sure where the water gets when the battery is blocked, but that whole well gets filled with water and seaps in somewhere
 
#30 ·
Folks,

There are 2 drain holes on my '98. One underneath the battery tray and the other behind the brake vacuum booster. Been there, done that...
I've seen some threads on Edmunds about this issue, including a couple where the water was deep enough in the battery area that the brake booster actually ingested water via vacuum. At least one engine got hydrolocked :icon_eek: , another had billowing clouds of water vapor coming out the exhaust.

It because of this I'm regularly checking the plenum area after car washes and during rain storms - what an f'ing poor design. No mention of checking these drains in the owner's manual. No mention of it in the routine maintenance schedule on VW.com's website. And, on top of that, the dang things are not even visible without removing the cover and the battery. Just really poor design...

On the other hand, it just underscores, again, what a great resource PW is!