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VW Golf IV 3D - water in the legs - Water collects on the passenger mat

Bullseye 6615 13
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  • #1 16773892
    Bullseye
    Level 27  
    Posts: 1454
    Help: 55
    Rate: 89
    Hi,
    some time ago I noticed that my windows in the Golf were parching terribly, and that I was driving myself, I did not notice that it was because of the damp on the floor.
    The passenger behind the driver has a lake and I don't know where it comes from, from the bottom it looks like the countryside is okay.
    Where to find the culprit?
    It looks as if only the floor was wet, the upholstery in the circle is dry.
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  • #2 16773916
    marqqv
    Level 32  
    Posts: 1758
    Help: 162
    Rate: 606
    Check that there is no loss of fluid in the car. If not, take a hose with water and pour it over the car and check if it is leaking somewhere (door seals, glass, etc.). Certainly the bottom is healthy and whole.
  • #3 16773980
    Bullseye
    Level 27  
    Posts: 1454
    Help: 55
    Rate: 89
    Well, I don't see anywhere to drip :(
    There is no leakage in the radiator fluid, because the driver is dry.
  • #4 16774009
    marqqv
    Level 32  
    Posts: 1758
    Help: 162
    Rate: 606
    Recently, I had such a case of Corsa C, the sidewalk under the driver is wet, it is nowhere to be seen that it is poured through gaskets, etc. The reason was the lack of a gasket in the rear lamp and water could overflow to the front of the car. So if nobody poured you inside, there must be a reason :D
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  • #5 16774325
    Anonymous
    Level 1  
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  • #6 16774619
    Bullseye
    Level 27  
    Posts: 1454
    Help: 55
    Rate: 89
    Ok, before I start pouring the water over the paint, how am I supposed to dry it pretty quickly? The garage is gone because I don't have one :(
    I lined up with bags with balls that absorb moisture like (such from RTV equipment) almost 100 pieces, but still wet as at the beginning
  • #7 16774821
    Staszek49
    Level 35  
    Posts: 2421
    Help: 228
    Rate: 1137
    If you are sure that your heater is not leaking, check (observe) the door seal during rainfall. Maybe the floor plugs (bottom) fell out. If you have a rear wiper, look for a leak in a damaged washer tube (or connection) that is routed to the right side of the body. In what condition do you have the thresholds in the car, especially the right one, because heavily corroded and holes can cause flooding of the floor. Check the lower part of the right fender, because if it is corroded, the part of the wheel arch that touches the "pillar" of the front door will also have holes and water from under the wheel will pour inside.
  • #8 16774902
    Bullseye
    Level 27  
    Posts: 1454
    Help: 55
    Rate: 89
    The seal is observed, because the floor is completely and there is no rust :)
    The trunk is dry, so I exclude the wiper, I never used it for the rest :)
  • #9 16774942
    Anonymous
    Level 1  
  • #10 16775014
    Bullseye
    Level 27  
    Posts: 1454
    Help: 55
    Rate: 89
    Oh, I will check!
    Because not so long ago I replaced the faulty window mechanism :)
  • #11 16775085
    moto-kord
    Level 28  
    Posts: 800
    Help: 137
    Rate: 501
    Bullseye wrote:
    Because not so long ago I replaced the faulty window mechanism :)

    And at 99% you have water in the cabin. Loosen the sheet metal, tighten the silicone and it will be
    well.
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  • #12 16775168
    Mario-1990
    Level 17  
    Posts: 185
    Help: 27
    Rate: 49
    I had the same problem in Leon, the reason was the seal between the sheet holding the glass mechanism and the entire door, water poured from under the upholstery to the threshold and then inside. And all thanks to the replacement of the glass mechanism. So I took out the upholstery and sealed it with silicone, unfortunately after the winter the problem came back, I took out the upholstery a second time and sealed it with glass glue and for now peace of mind. If you are not sure, remove the upholstery, open the door and pour water from the hose for a few minutes on the glass, the awl will come out of the bag. ;)
  • #13 16790499
    Bullseye
    Level 27  
    Posts: 1454
    Help: 55
    Rate: 89
    I found the problem, one rubber plug fell out, hidden behind the threshold, and the other just behind the front threshold at the height of the riser .....

    Where to find one? how is it called ?
    (because it's a shame to ride on a reptile tape :) )
  • #14 16790615
    moto-kord
    Level 28  
    Posts: 800
    Help: 137
    Rate: 501
    Drive to the site, these are 4/5 zlotys
    the opening have different dimensions of the plugs.
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Topic summary

✨ The discussion revolves around a VW Golf IV experiencing water accumulation on the passenger side floor, leading to dampness and fogged windows. The user initially suspects a leak but finds no visible signs of fluid loss. Responses suggest checking various potential sources of leaks, including door seals, rear lamp gaskets, and the condition of the vehicle's thresholds. One user shares a similar experience with a different model, indicating that a missing rubber plug can cause water ingress. The user eventually identifies a missing rubber plug behind the threshold as the source of the problem and seeks advice on where to find a replacement.
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FAQ

TL;DR: In Mk4 Golf/Leon cases, 99% of cabin water comes from a leaking door carrier plate after window-mechanism work; “tighten the silicone and it will be well.” [Elektroda, moto-kord, post #16775085] Why it matters: This FAQ helps VW Golf IV owners quickly find and fix wet-floor leaks without trial-and-error.

Quick Facts

Why is water collecting on the passenger mat in my Golf IV?

Most often the door carrier plate seal leaks, especially after a window regulator repair. Water runs behind the trim and onto the sill, then the carpet. One expert noted “at 99% you have water in the cabin” from this plate and advised resealing. [Elektroda, moto-kord, post #16775085]

How do I hose-test the door to confirm a leak?

Remove the door trim, open the door, and pour water on the exterior glass for a few minutes. Watch the inner door and sill for drips. If water emerges from the plate perimeter, the carrier plate seal needs resealing. "The leak will come out of hiding." [Elektroda, Mario-1990, post #16775168]

What is the door carrier plate?

It’s the metal panel that holds the window mechanism. If its perimeter seal is bent or disturbed during regulator replacement, water bypasses inside and spills to the threshold, then the cabin. Resealing resolves the ingress. [Elektroda, Mario-1990, post #16775168]

How do I reseal a leaking carrier plate? (3 steps)

  1. Loosen the plate, clean old sealant, and dry the mating surfaces.
  2. Apply a continuous bead of sealant around the plate perimeter.
  3. Refit and tighten evenly; water-test again before refitting trim. “Loosen the sheet metal, tighten the silicone and it will be well.” [Elektroda, moto-kord, post #16775085]

Silicone didn’t last through winter—what sealant should I use?

Use automotive glass adhesive for a longer-lasting bond. One user resealed with silicone, saw the leak return after winter, then switched to glass glue with lasting success. [Elektroda, Mario-1990, post #16775168]

Could missing floor plugs cause a soaked footwell?

Yes. Owners found rubber floor plugs hidden near the sill and at the front threshold missing, which allowed road water to enter and flood the carpet. Replace the missing plugs to stop ingress. [Elektroda, Bullseye, post #16790499]

Where do I buy floor plugs and what do they cost?

Buy them at a dealer or parts counter. Expect roughly 4–5 PLN per plug, and note that openings take different plug sizes, so bring measurements. [Elektroda, moto-kord, post #16790615]

Could water be coming from inside the door even if outer seals look fine?

Yes. If the inner moisture barrier or carrier plate was distorted during previous door work, water can leak from the door interior into the cabin despite intact outer seals. [Elektroda, Anonymous, post #16774942]

What other leak paths should I check besides the doors?

Inspect rear lamp gaskets and the rear washer tube routed on the right side. Leaks there can carry water forward and soak the floor, even if the trunk looks fine. [Elektroda, Staszek49, post #16774821]

Should I suspect the heater core if only the passenger floor is wet?

Start by checking coolant level. If there’s no coolant loss, focus on water ingress tests like the door hose test and floor plug inspection before disassembling HVAC. [Elektroda, marqqv, post #16773916]

How can I dry the soaked carpet quickly without a garage?

First stop the leak. Lift the carpet and underlay, and allow airflow; partial disassembly may be needed. Tracing with dyed water helps verify the fix before final drying and reassembly. “Sometimes you have to disassemble half the car.” [Elektroda, Anonymous, post #16774325]

Can the trunk being dry rule out rear sources?

Not completely. A user with a dry trunk still faced front-floor wetness from other paths. Check door plates and floor plugs before fully ruling out rear-related leaks. [Elektroda, Bullseye, post #16774902]
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