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Hi, I am new. Cool this topic here is also big.
My 1999 limousine was cleaned out yesterday. I removed the Interiour-Air-filter housing (broken seal, a lot of rust), the housing of the ECU and the battery tray to get acces to all the dirt. I think I was first one to do so. I attached some pics. Everything was sealed with PU-sealant, so I might be the last who did this job.

Anyway I found a clear hose under the battery with a broken connector. Anyone knows what it is for? Do I need it (1)?
And the rubber sealant behind (2) is broken. Also, do I need it?
I would replace the rubber seal, rebuild the rusted off metal either with Epoxy or by cutting and welding new metal into the area.
 

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Thats funny you bring this up. My vehicle was going into limp mode on first start every day. And it has become worse. This weekend I lifted my carpet to find my TCM just sitting above the brink of sitting in a puddle of water. Just enough for the water to creep into the wiring.

I agree - this is a really important task to avoid the tears of replacing a component.
 

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2005 VW Passat Variant 1.9 TDi Euro B5.5
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This is especially for the newer users here, but is also a reminder for the older users here; now is the time to start thinking about cleaning out the leaves that inevitably work their way into your engine bay.
Perfection! I can now return the goldfish and aquarium decorations.Many thanks.
 

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Just found out about Passat World (how??) and joined immediately.
Got my first "ooh"-moment already. Thanks for the reminder!
 

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This is especially for the newer users here, but is also a reminder for the older users here; now is the time to start thinking about cleaning out the leaves that inevitably work their way into your engine bay.

The area I am talking about is specifically under the battery tray and the master cylinder. Under these two areas, there are two grommets that allow water to drain out of that area. If leaves clog the drain, water backs up and sits in there.

If enough water collects there, it will flow into the passenger compartment and will flood out your Transmission Control Unit (TCU) (for Tiptronic owners) and the Comfort and Convenience Module (CCM) (on all cars).
got mine done
 

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yep just had this problem on my VW Passat 2003 plate and it drove me made as I couldn’t remove the battery on my own to stop the glove box and passengers ( near side ) flooring from flooding and was sodden and started to go mouldy, I needed my two sons to get the battery out and vac up all the leaves and dried up mud and dirt. We’ve had some real heavy rain down fulls and all is good and dry. Definitely a job I may do twice a year from now on.
 

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This is especially for the newer users here, but is also a reminder for the older users here; now is the time to start thinking about cleaning out the leaves that inevitably work their way into your engine bay.

The area I am talking about is specifically under the battery tray and the master cylinder. Under these two areas, there are two grommets that allow water to drain out of that area. If leaves clog the drain, water backs up and sits in there.

If enough water collects there, it will flow into the passenger compartment and will flood out your Transmission Control Unit (TCU) (for Tiptronic owners) and the Comfort and Convenience Module (CCM) (on all cars).
Another place to keep clean are the drain holes on both sides of the sunroof!
 

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In my 2002 Passat Wagon, the accumulated water made its way into my brake booster and fouled the booster. Discovered THAT neat situation the next time it froze, and my pedal was ROCK HARD. No brakes!!
 

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I pinched my nipples today...

on my 1998 GLS that is.
All that came out was a few second steady stream of sand. :oops:
 
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I found a large amount of leaves, seeds and acorns stuffed between the heat shield above the cat and across the valve cover. Not sure if it's a squirrel or a rat. Luckily, it did not ignite. Check your car every couple of days if it's parked as they may be nesting there.
 

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I did the drain under the Battery months ago, Did the sunroof drains, did the door drains, The TCU was still under water on the passenger floor board, come to find out I didn't clean all the leaves out from under the battery, clogged that again, cleaned it out and since carpet was pulled back on the passenger side (with passenger seat out), I resealed the drain near your left foot up high that is the drain funnel, going to relocate TCU\TCM being replaced or what ever you want to call it, so it can't be under water again
 

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It helps to remove the rubber drain grommets under the battery completely as they don't let much through in the 1st place.
I did the drain under the Battery months ago, Did the sunroof drains, did the door drains, The TCU was still under water on the passenger floor board, come to find out I didn't clean all the leaves out from under the battery, clogged that again, cleaned it out and since carpet was pulled back on the passenger side (with passenger seat out), I resealed the drain near your left foot up high that is the drain funnel, going to relocate TCU\TCM being replaced or what ever you want to call it, so it can't be under water again
 

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I did the drain under the Battery months ago, Did the sunroof drains, did the door drains, The TCU was still under water on the passenger floor board, come to find out I didn't clean all the leaves out from under the battery, clogged that again, cleaned it out and since carpet was pulled back on the passenger side (with passenger seat out), I resealed the drain near your left foot up high that is the drain funnel, going to relocate TCU\TCM being replaced or what ever you want to call it, so it can't be under water again
I’m doing the same on my B5 today, but remember if the water is still getting in yoI’ll soon have toxic mould under the carpet. I don’t care so much as this car is only to last until end of 2022.
 
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