Hello, I write because I bought a car vw passat b5 version after lifts only there is a problem with it was not raining it was all ok and now it's autumn is back from the passenger side is wet on the floor I really do not know why I checked under the battery if it is clogged and put in wire...

I suggest to check the outflows from under the glass at the beginning if they are not clogged (left and right) it is also worth checking the patency of the outflow from the klima condenser and of course, there is no hole in the floor

It's about the 4 holes that are and I have to check the left and right side and how to check and detach them if necessary. how to check the climate of this condenser where it is located, please picture and detailed description. And with this floor from the bottom I was looking at it is a built-in plastic housing and it's hard to see because I do not have a channel to check accurately. Added after 2 [minutes]: You must dismantle the door panels and seal the plate screwed to the door. You can ask for more clearly and possibly some pictures

I do not know about you, but I at home in the re-house just poured some water in the cistern and knit with some flexible wire until the water orders (only the wire can not be sharp, not to stick anything, but hard enough to penetrate any dirt) me these runoffs are rubber do not know how it looks in the passat the outflow from the fan is either on the wall behind the engine in the bottom part or in the floor enter in google passat b5 klimy outflow and it will definitely pop out

Thanks tomorrow I will look after work and I will write what and how

After removing the sides, you should notice a water leak between the sheet and the door.

I had a similar problem, but under the lining was about a centimeter of water. The water got a damaged gasket on the base of the cabin filter. I replaced the entire base because, unfortunately, the gasket itself does not exist ..

As above ..... check if the battery does not float ....

I had similarly - in truth, in the citroen but ... Check if you do not have a wet liner in the trunk.U mint water was getting into the trunk, the car was often leaning forward and the water from the trunk was dripping on the rear rugs, Wet dry on the back wet .

[Solved] VW Passat B5 Version: Dealing with Rear Floor Wetness on Passenger Side

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#1 16753153 12 Oct 2017 18:09

pacak24 pacak24

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Post #1
16753153 12 Oct 2017 18:09

Hello, I write because I bought a car vw passat b5 version after lifts only there is a problem with it was not raining it was all ok and now it's autumn is back from the passenger side is wet on the floor I really do not know why I checked under the battery if it is clogged and put in wire half a meter into this hole and it seems to me that there is nothing jammed here is everything ok. So I lifted the chair in the back and pulled out the lining in the back and it is really wet but you can not see anything coming out. And the black film in a way how to deal with it and do so I count on the help of professionals.

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#2 16753229 12 Oct 2017 18:43

tapsiu2 tapsiu2

Level 8

» | Helpful post? (+3)

Post #2
16753229 12 Oct 2017 18:43

I suggest to check the outflows from under the glass at the beginning if they are not clogged (left and right)
it is also worth checking the patency of the outflow from the klima condenser
and of course, there is no hole in the floor
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#3 16753252 12 Oct 2017 18:53

moto-kord moto-kord

Level 28

» | Helpful post? (+4)

Post #3
16753252 12 Oct 2017 18:53

You must dismantle the door panels and seal the plate screwed to the door.
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#4 16753267 12 Oct 2017 19:00

pacak24 pacak24

Level 10

» | Topic author Helpful post? (+2)

Post #4
16753267 12 Oct 2017 19:00

It's about the 4 holes that are and I have to check the left and right side and how to check and detach them if necessary. how to check the climate of this condenser where it is located, please picture and detailed description.
And with this floor from the bottom I was looking at it is a built-in plastic housing and it's hard to see because I do not have a channel to check accurately.

Added after 2 [minutes]:

You must dismantle the door panels and seal the plate screwed to the door.

You can ask for more clearly and possibly some pictures
#5 16753276 12 Oct 2017 19:02

moto-kord moto-kord

Level 28

» | Helpful post? (+3)

Post #5
16753276 12 Oct 2017 19:02

It's about this sheet
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#6 16753295 12 Oct 2017 19:09

tapsiu2 tapsiu2

Level 8

» | Helpful post? (0)

Post #6
16753295 12 Oct 2017 19:09

I do not know about you, but I at home in the re-house just poured some water in the cistern and knit with some flexible wire until the water orders (only the wire can not be sharp, not to stick anything, but hard enough to penetrate any dirt) me these runoffs are rubber do not know how it looks in the passat
the outflow from the fan is either on the wall behind the engine in the bottom part or in the floor
enter in google "passat b5 klimy outflow" and it will definitely pop out
#7 16753308 12 Oct 2017 19:12

pacak24 pacak24

Level 10

» | Topic author Helpful post? (+4)

Post #7
16753308 12 Oct 2017 19:12

Thanks tomorrow I will look after work and I will write what and how
#8 16753326 12 Oct 2017 19:19

moto-kord moto-kord

Level 28

» | Helpful post? (+2)

Post #8
16753326 12 Oct 2017 19:19

After removing the sides, you should notice a water leak between the sheet and the door.
#9 16896778 17 Dec 2017 15:28

Pawels1004 Pawels1004

Level 1

» | Helpful post? (+4)

Post #9
16896778 17 Dec 2017 15:28

I had a similar problem, but under the lining was about a centimeter of water. The water got a damaged gasket on the base of the cabin filter. I replaced the entire base because, unfortunately, the gasket itself does not exist ..
#10 16896844 17 Dec 2017 16:04

autoas autoas

Level 42

» | Helpful post? (+4)

Post #10
16896844 17 Dec 2017 16:04

As above ..... check if the battery does not float ....
#11 16896876 17 Dec 2017 16:15

zdzichra zdzichra

Level 32

» | Helpful post? (0)

Post #11
16896876 17 Dec 2017 16:15

I had similarly - in truth, in the citroen but ... Check if you do not have a wet liner in the trunk.U mint water was getting into the trunk, the car was often leaning forward and the water from the trunk was dripping on the rear rugs, Wet dry on the back wet .
#12 18098098 05 Aug 2019 12:21

pacak24 pacak24

Level 10

» | Topic author Positive voted Helpful post? (+7)

Post #12
18098098 05 Aug 2019 12:21

The problem has not been solved
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Topic summary

✨ The discussion revolves around addressing the issue of wetness on the rear passenger side floor of a VW Passat B5. The original poster has checked the battery area for clogs and found no issues. Suggestions from other users include inspecting the drainage from under the windshield, ensuring the climate control condenser's outflow is clear, and checking for leaks around the door panels. One user mentioned a potential problem with the gasket on the cabin filter base, which could lead to water accumulation. Additional advice includes checking for water in the trunk, which may also contribute to the wetness in the rear. Users recommend using flexible wire to clear any blockages in the drainage systems.
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FAQ

TL;DR: VW Passat B5 wet rear floor often traces to blocked drains or leaks at the cabin filter/door plate; users report “under the lining was about a centimeter of water.” "the gasket itself does not exist" for the filter base. [Elektroda, Pawels1004, post #16896778]

Why it matters: Trapped moisture can corrode wiring, damage control modules, and create persistent odors—fix it early.

Quick-Facts

Typical symptoms: damp rear passenger carpet, soaked underlay, and lingering odor after rain. [Elektroda, pacak24, post #16753153]
Common leak paths: cowl drains, A/C condensate outlet, and door carrier plate seal. [Elektroda, tapsiu2, post #16753229]
Cabin filter housing: damaged base lets water in; base replacement required. [Elektroda, Pawels1004, post #16896778]
Plenum flooding check: if the battery area “floats,” drains are clogged. [Elektroda, autoas, post #16896844]
Water can migrate from trunk to rear rugs when parked nose‑down. [Elektroda, zdzichra, post #16896876]

Quick Facts

Typical symptoms: damp rear passenger carpet, soaked underlay, and lingering odor after rain. [Elektroda, pacak24, post #16753153]
Common leak paths: cowl drains, A/C condensate outlet, and door carrier plate seal. [Elektroda, tapsiu2, post #16753229]
Cabin filter housing: damaged base lets water in; base replacement required. [Elektroda, Pawels1004, post #16896778]
Plenum flooding check: if the battery area “floats,” drains are clogged. [Elektroda, autoas, post #16896844]
Water can migrate from trunk to rear rugs when parked nose‑down. [Elektroda, zdzichra, post #16896876]

Why is my Passat B5’s rear passenger-side floor wet after rain?

Likely causes include clogged cowl drains under the windshield, a blocked A/C condensate outlet, or a leak point such as the door carrier plate seal. Also verify there’s no perforation in the floor. These paths channel water into the cabin if obstructed or unsealed. [Elektroda, tapsiu2, post #16753229]

How do I check and clear the cowl/windshield drains safely?

Pour water into the cowl to see if it exits quickly. If it backs up, gently feed a flexible, non‑sharp wire to break debris until flow restores. Avoid sharp tools that can puncture rubber drains or wiring. “Only the wire cannot be sharp.” [Elektroda, tapsiu2, post #16753295]

Where is the A/C condensate drain and how do I test it?

The condensate outlet sits low on the firewall or floor area. With A/C running, look for steady drip beneath the car. No dripping suggests a blockage. Carefully clear it as you would the cowl drains, using flexible wire and care to avoid damage. [Elektroda, tapsiu2, post #16753295]

Do I need to reseal the door carrier plate?

Yes, if water tracks through the door. Remove the door panel and reseal the metal carrier plate that bolts to the door frame. An expert advises, “You must dismantle the door panels and seal the plate screwed to the door.” [Elektroda, moto-kord, post #16753252]

How can I confirm a leak between the door sheet and the door?

Remove the interior trim and observe during a controlled water test. If you see water escaping at the carrier plate joint, the seal has failed and needs resealing to stop ingress. [Elektroda, moto-kord, post #16753326]

What is the door carrier plate on a Passat B5?

It’s the metal sheet assembly that carries the window regulator and seals the door’s inner opening. If its seal fails, water bypasses the door drain path and enters the cabin. See the referenced sheet photo for identification. [Elektroda, moto-kord, post #16753276]

Could the cabin filter housing cause flooding under the carpet?

Yes. A damaged cabin filter housing base can let rainwater enter the cabin. One owner reported about 1 cm of water under the lining and replaced the entire base because the gasket wasn’t sold separately. [Elektroda, Pawels1004, post #16896778]

Is it okay to poke drains with any wire?

Use only a flexible, non‑sharp wire. Sharp tools can pierce rubber drain grommets or nearby components, creating new leak paths or electrical faults. “Only the wire cannot be sharp.” [Elektroda, tapsiu2, post #16753295]

My battery area looks flooded—what does that indicate?

It indicates plenum chamber drains are blocked. Water accumulating here can spill into the cabin. As one expert put it, check whether the battery appears to “float.” Clear the drains immediately. [Elektroda, autoas, post #16896844]

Why is only the rear carpet wet while the front seems dry?

Water can collect in the trunk and run forward when the car is parked nose‑down. It then saturates rear carpets and underlay first, making the rear seem wetter. [Elektroda, zdzichra, post #16896876]

I already cleared the battery drain with a wire but it’s still wet—what next?

Move on to door diagnostics. Remove the door panel and reseal the carrier plate. This fix addresses leaks that clearing cowl drains alone will not solve. [Elektroda, moto-kord, post #16753252]

Can wet carpets return even after a fix?

Yes. If you fix one path but miss another, moisture persists. Some owners report unresolved issues until all leak points are addressed and verified with water testing. [Elektroda, pacak24, post #18098098]

How much water can collect under the carpet before I notice?

Owners have found about 1 cm pooled under the carpet and insulation. That hidden moisture can take days to dry and may corrode connectors if ignored. [Elektroda, Pawels1004, post #16896778]

What’s a quick 3‑step way to diagnose blocked drains at home?

Pour water into the cowl and observe outflow beneath the car.
If slow, feed a flexible, non‑sharp wire to clear debris.
Retest for a strong, immediate outflow; repeat gently if needed. [Elektroda, tapsiu2, post #16753295]

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