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baus

Check your scuttle drains!

Scuttle Drain Check  

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  1. 1. After checking it, was your drain blocked?



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While servicing my car I took off the pollen filters, lifted the plastic underneath, and discovered a puddle of water at the bottom of the drivers side scuttle drain, where the brake fluid reservoir is.

There was about 2 litres of water here... right next to it is the wiring loom and bonnet release cable that run into the cabin - if the water level had gotten any higher or if I parked at an angle, water would have entered the cabin no doubt, and electrical equipment would have been at risk of getting fried (modules around the pedals, subwoofer under the seat etc.)

Not sure if this is related, but randomly and very occasionally my brake pedal would be hard before the first start of the day (having been perfectly normal the day before). This could be something to do with water being so close to the brake servo unit, as Way520 mentioned in a different post.

Moral of the story? Check your drains!


If anyone figures out how to check the left side scuttle drain, let us know. There's a huge box of electrics (ecu?) there which restricts view of the drain and any puddles that may be there.

3xah9l.jpg


I added the poll as it'd be a great way to track how common this problem is.

Edited by Baus

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I had a yr 2000 VW Passat and it was written off because of this, water leaked in to the car and in to the brake servo and that was it - scrapped it in the end!

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scrapped it in the end!

woah!

Yeah, this was a common problem on VW Sharans as well, all the modules were in a nice well under the passenger seat. It filled up so nicely, all the modules went bust!

Sounds like they should be part of the service schedule!

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Mine was blocked solid too and only noticed when removing swirl flaps....Pushed a screwdriver through the hole to unblock it...

It then got me thinking about tthe right hand side which looked fine and dry but i don't have a clue on how to get the ECU housing box out. I did open the top lid out but never bothered to disconnect the ECU metal housing box

Does anyone know if this side could be affected too because if it is then you would be in a heap of shit if it were to flood the ECU housing box

Edited by 5SPORT

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Mine had a couple of pints of dirty water in too, I tried to poke it clear with a screwdriver but the whole grommet pushed through and landed on the lower engine cover lol,

Mine has a crap seal between the Pollen housing (the big bit) and windscreen. Water from the windscreen can run straight down into that void by the brake servo. If I try to close the gap I can't get the securing screws in.

Happened on my old Saab too, water ran past the cabin filter housing, collected under the cabin blower fan until that went bang.

Just about to order a replacement windscreen Wiper motor for a girl at works Pug 306, same place as our servo, her wiper motor was completely submerged.

Who do Car designers employ to come up with this farce?

Edited by chr15gb

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Mate had his vectra flood a couple of weeks ago fortunately all the modules on the floor were raised on brackets.

Did my drivers side the other day but didnt look at the pasenger.

Sent from my GT-P3110 using Tapatalk 2

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I could barely see under the ecu on the passenger side, but I think I did see water standing there too. I must investigate further at some point... I couldn't see any obvious screws to undo the ecu. I didn't bother putting the grommet back, however.

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I unblocked mine the other day but as its rained quite heavy last night I'm going to check it again just for peace of mind to see if its still clear.

I had the same problem on my A4, water got into the car and the servo. cost me a whole lot of cash to get it fixed.

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It's a common problem on all cars. Always worth checking the scuttle panel for flooding, the little grommets that are fitted in the drain holes always block with gunk over time. It's best to push them out completely leaving just a hole.

Most of the time as the water level rises and the pressure builds up the water will push gunk out of the blocked holes and the water drains. If it fills to the top, then it can get into the brake servo and cause brake loss or worse. It also sometimes swamps the pollen filter and the first thing you'll know is a pool or water in the footwell.

That's OK in most cars because it just needs drying out, but in Passat the passenger footwell is where all the control modules sit.

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I could barely see under the ecu on the passenger side, but I think I did see water standing there too. I must investigate further at some point... I couldn't see any obvious screws to undo the ecu. I didn't bother putting the grommet back, however.

Let us know how you get on with the ECU side Baus. I was gonna have another look the other day but accidentally dropped my allen key down the side whilst undoing the ECU housing lid :angry: so am stuffed until i buy a replacement

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Pretty hacked off-had deep puddle in rear driver's footwell in April, took it to local specialist who has looked after me relatively well in the past. They diagnosed the puddle as a blocked bung in the drain as in the photograph above and stripped out all the carpets to dry and then re-fitted for £300. Seems they didn't bother to change the bung though, as 6 months later I found another puddle today. Bit cheesed off, took out pollen filters and the covers (managed to snap two of the retaining clips d'oh) and wiggled screwdriver through the bung and all the water ran out. Can't be arsed checking that every day!!

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So guys I just got told about this by my Indy who was going about changing the brake fluid. He's clearing the crap out and draining the water. Thankfully I've never had water enter the car etc. But Indy said brake servo was totally submersed in water. Don't know yet if he's checked the passenger side or not.

Question is what's the best way of dealing with this other than self checking it every fortnight ! I wanna know if the grommet is supposed to stay or ok to get rid off ? To be honest, I've never visually examined this area myself so don't understand how it looks or gets blocked and how there's a risk of water entering the cabin. Could someone please make this easy and just give their opinion on what should I do now or in the future as best preventative management (btw car is at Indy right now as i seek your expect thoughts :). Cheers

Edited by 530dE60

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Cheers Baus. Great, I'll get Indy to kiss goodbye to grommets on both passenger and driver's side. Does make one scratch the head as to why on earth did BMW put the grommet in the first place enabling the thing to get blocked repeatedly.

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it's not just them, it seems MANY manufacturers have scuttle drain problems.

Take some pics of the passenger side if poss? I still haven't checked mine, had no time. The ECU box does look a lot safer though, with a bit more clearance, although one shouldn't risk it, it's worth £800!

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Does anybody know how to pull the grommet thing through from under the car cause there ain't no way I can check/see the passenger side due to the ecu housing?

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I don't think you can get access from underneath, there's just too much stuff in the way!

 

Do you suspect water in yours? (although if my right side was blocked, my left one probably is too! Good thing the ecu's higher than the brake servo!)

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There are 5 torque bolts holding the lid of it on. I don't recall seeing what holds the box to the bulkhead. I'm presuming u need to physically remove the ECU - which I'm not brave enough to do - to see the securing ones.

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