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Discussion Starter #1
Hi,


I have been having a minor leak of coolant which i cant find to locate. Its not the radiator it looks like its coming closer by the water pump. Does anyone have a "check list" where to look for coolant leaks on a 2007 VW V6 3.6? I also recently noticed after i start the car ( live in Canada -19c) after 3-4 minutes white steam/smoke is coming out of exhaust smelling like coolant? Now i checked the coolant level today and its now below min line but i dont get a warning on dashboard? What is going on?
 

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A crack in the EGR cooler or a blown head gasket is the most likely culprit in cases where you can't find any puddles/remains/residue of the lost coolant outside of the car - especially if you're seeing lot of white smoke, which means your engine is "bleeding" inwards.

That said make sure first that you definitely do not have coolant drips anywhere under the car, and also check the metal coolant lines running to and from the Webasto heater in the wheel arch. Top up the coolant, start the engine, and let it idle for a while (preferably with the climatronic set to a higher temperature than ambient, so, you make sure that the Webasto will be also engaged), and then check for coolant drops.

Starting the engine is important, because unless you've a huge hole and a completely broken/separate pipe somewhere, coolant might not actually be able to escape with no pressure in the system.
 

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alex30

I do have coolant drips under the car. I also noticed it keeps dripping coolant when just sitting. Do i need remove the plastic cover from the wheel arch in order to get to the metal pipes that run to the webasto heater? Do you know why i dont get a warning from the dashboard for low coolant? I ran a scan with vcds but no codes were shown?
 

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I do have coolant drips under the car. I also noticed it keeps dripping coolant when just sitting.
Where are those dips located exactly? Are you sure it's coolant (pink), not just simple condensate water from the A/C drain pipe or something?

Do i need remove the plastic cover from the wheel arch in order to get to the metal pipes that run to the webasto heater?
No, you just need to look up the wheel well/arch. Look at the pictures and info in these threads:
https://www.mytreg.com/index.php?/topic/83988-coolant-loss-dripping-under-the-left-side-wheel-arch-lhd/
https://www.mytreg.com/index.php?/topic/84078-coolant-leak-ns-wheel-arch/
https://www.clubtouareg.com/forums/f93/hole-in-coolant-line-in-drivers-side-wheel-well-284283.html

Do you know why i dont get a warning from the dashboard for low coolant?
Because the warning is not triggered right when the coolant level goes below minimum, but some time after that (likely to prevent false positives). As long as you get that warning after a while, I would consider that behavior normal.
 

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I would just replace the water pump if it was my vehicle.

The water pump leaks more often on a VW then all the other hoses combined.
 

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So how do i confirm that my water pump is the issue and not a hose close by???
You look at it? The coolant should leave a trace of white/pink residue wherever it flows. If you have any doubts, clean the area and let the residue reappear. You'll not get a more obvious evidence of a leak than that.
 

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alex30

Ok if i replace the water pump and no more leaks will this fix the issue of smelling coolant from exhaust?? Or is this not related?
 

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Well, you could bring it into a mechanic, but there is not an easy way to check for all possibilities. You could spend several hundred dollars trying to rule out possibilities.

We are 99% sure you have a current water pump leak and I would call the other second concurrent leak a 10% chance.

If you do have a second leak, the most likely place to look is in the EGR system. Check the PCV also since you are right beside it and they can sometimes be problems.

The best bet is probably let a mechanic look it over and to give you a quote for the repairs. Anyone who works on a lot of VW/Audi will know exactly where to look.
 

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A crack in the EGR cooler ...
The VR6 does not have an EGR cooler... :serious::confused:

the metal pipes that run to the webasto heater? Do you know why i dont get a warning from the dashboard for low coolant? I ran a scan with vcds but no codes were shown?
The VR6 does not have a factory equipped Webasto heater in North America. V10 TDIs only. Low coolant warning will trigger when the reservoir is near empty, which is below the minimum line on the reservoir.

Pressurize the cooling system and check for leaks, it should be quite visible.
 
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