2004 V10 TDI - coolant leak left side - Club Touareg Forums
 
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post #1 of 10 Old 06-10-2018 Thread Starter
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2004 V10 TDI - coolant leak left side

Noticed a small coolant leak on the driver's side of the vehicle. Not much, but enough.

The leak appeared to be from one of two hoses that are connected to two metal pipes that lead back to the webasto. I swapped in a screw clamp, but I noticed the leak continued, so I put the suspension on x-tra high and put it on ramps to get a better look. I noticed that the boot on the left tie rod was wet (pink) and this is above the webasto pipe, so I need to do some more tracing this week. Can't see a darn thing from above.

Appreciate any suggestions/diagrams to help me trace this.

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post #2 of 10 Old 06-10-2018
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The pipes are a btch to replace, because they're running under the wiper cowls, between the two firewalls, and are very hard to access.
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post #3 of 10 Old 06-11-2018
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post #4 of 10 Old 06-11-2018 Thread Starter
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Yep. I'll need to trace the two hoses to their connection point. Pics 5 & 7 on this thread post show the junction of the two metal pipes and rubber hoses just above the left tie rod boot. I'll need to trace them higher to find the leak.

https://www.clubtouareg.com/forums/f9...ml#post1272073

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post #5 of 10 Old 06-11-2018
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Quote:
Originally Posted by 4xMotionTDI View Post
I'll need to trace them higher to find the leak.
I'm not sure you'll able to. My leak was pretty serious (I lost like 4 liters of coolant in just 40 kms), and still, the leak wasn't visible - not even when the old pipes were removed and I could inspect them freely in my hand under good lighting conditions. If I filled the pipe with water, I could see a thin thread of water running down on the outside of the pipe, but I could only tell where the leak was from where that thin thread of water started, not by there being a distinct spot that looked like a hole or much different from its surroundings.

Of course the pipes were also corroded at the point of the leak, where they left the wheel well, but even perfectly fine pipes will have corrosion marks there - so, that by itself is not indicative of the location of the leak. That said if your leak is not at the same spot as usual, and it's not actually pipes that area leaking, then you have a more serious issue, and the leak is originating from the heat exchanger, and water is just running down the pipes.

Anyway, I personally would assume that its the pipes that are leaking, and I'd have them replace anyway, because at this age they could fail any time, and because of the large amount of labor associated with dismantling that part of the engine, which you will have to do anyway, even if its not the pipes that are leaking.
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post #6 of 10 Old 06-11-2018 Thread Starter
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Thank you for the reply Gnits.

So you think the problem is with the metal pipes leading back to the Webasto? Or do the rubber hoses connect to other metal pipes up and forward of the tie rod boot that you think are corroded/leaking?

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post #7 of 10 Old 06-11-2018
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Quote:
Originally Posted by 4xMotionTDI View Post
So you think the problem is with the metal pipes leading back to the Webasto? Or do the rubber hoses connect to other metal pipes up and forward of the tie rod boot that you think are corroded/leaking?
I have no clue what's leaking in your car. But the aluminum pipes are known to corrode and get leaky.

If you see any coolant residue above (the level of) the rubber hoses, then it's safe to assume that it's not the hoses leaking, because the leaking fluid would obviously not crawl upwards on the outside of the aluminum pipes and create deposits there, but flow and drip downwards. So, in this case the leak has to be somewhere above where you see the coolant residue on the pipes.

Does that make sense to you?
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post #8 of 10 Old 06-11-2018 Thread Starter
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Yes.

By chance do you know what those two rubber hoses tie into - somewhere above the boot on the tie rod?

I had my front drive shaft, tie rods and steering rack replaced a few weeks ago - which is about when this leak started. So I'm somewhat hopeful it's just something jostled loose up there.

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post #9 of 10 Old 06-11-2018
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Quote:
Originally Posted by 4xMotionTDI View Post
By chance do you know what those two rubber hoses tie into - somewhere above the boot on the tie rod?
They're running from and to the Webasto auxiliary heater. "Cold" water runs down into the heater through one pipe, gets heated there, and comes back through the other, "hot" pipe. On the other side this "hot" pipe is connected to the heater core (that's heating the air prior to it being released into the cabin), and then to the rest of the coolant circuit.
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post #10 of 10 Old 06-16-2018 Thread Starter
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We have a wiener! Well mostly...

One of the two rubber hoses leading to or from the metal pipes leading to/from the Webasto has a pinhole leak that happens to spray upward under pressure (when hot). Looks like a fairly simple job to replace both rubber hoses (part 7L6122073, I think). I probably don't even need the molded hoses...

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