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  1. #1
    danb986's Avatar
    In awe of VCDS

    Join Date
    Apr 2011

    Water Loss - Shouldn't be a porous head though

    I know what you're thinking; 2.0 TDI with a BKD engine, it could be the dreaded porous head.
    But mine is a 2007 with a code C cylinder head. As far as I understand (and from what the Audi parts guy said when I was buying coolant) the porous head issue only affected early 2.0 TDI engines with an A or (less commonly) B cylinder head code.

    It's lost about a litre over the last year, but now it's lost about an inch this week (200 miles) from the expansion tank. It starts and runs fine though.

    I can't see any water where I park, but the undertray and never ending rain might be masking it.

    I thought maybe a faulty tank cap could be leaking vapour, but the Audi parts guy said he'd never sold any of these so it's unlikely. Is there any way I can test this, or is this an unlikely culprit?

    I also thought it could be the EGR cooler as this seemed common after a bit of Googling, but I remember Nige saying once that these aren't usually the cause, so I want to avoid spending £350 on something that's not faulty.

    Apparently another common one is the radiator, but I don't think there's anything dripping and I don't know which bit is the usual spot for leaks. I thought even a tiny pin prick hole in a rad would cause a jet of water to spray out.

    Is a leak of this quantity likely to leave a puddle on the floor, or would it just evaporate?

    Can anyone suggest what's the most common cause of leaks so I can narrow down my searching. It's driving me crazy, so if anyone can suggest anything I'd be really grateful.
    Now: 2010 A3 SB S-Line Black Edition 2.0TDi 140CR. Panther Black
    Retro'd: Black S-Line badges | Private Plate | Come home lights activated | Fogs as corning lights activated | Hill hold assist activated | TPMS (via VCDS) activated | 3.5" s/s tailpipe | LED interior lighting.

    Gone: 2007 A3 SB Sport TDI 140. Dolphin Grey

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  3. #2

    Join Date
    Jan 2010
    Rhubarb Triangle
    Could possibly be a head gasket. Never actually heard of that problem before on a BKD but you never know.

    Not sure how to test for it either unless VCDS would show silly figures in engine measuring blocks - sorry !

  4. #3
    Sportback owner

    Join Date
    Apr 2007
    Dan, make sure that you look for leaks immediately after turning off the engine, having waited until the engine reaches its full operating temperature. That is maximum water pressure, and should show you any external leaks. Also look for stains around water pipe joints and the corners of the radiator. By the way, no BKD engine loses one liter of coolant over a year. It is a closed system after all, so ANY loss needs to be investigated immediately. When the engine is hot (max leaks) the water is also very very hot, and indeed will evaporate quite quickly. A small leak may boil away so fast you may miss it. Go after the joints first, then worry about the water pump and/or gasket. Good luck.
    French A3 Sportback 2006, 2.0L 140 TDI, DSG, RSN-E, Ambient lighting, Auto-lights/wipers, Reverse assist, Dolphin Grey, 17" wheels, Leather seats, Cruise control, Roof bars.

  5. #4
    mjr901's Avatar
    S3 Pollution Plus+ Edition

    Join Date
    Nov 2011
    Have the head pressure tested?
    2012 Ibis Black Edition S-tronic S3, 3 Door, Shark Stage 2, MTC Intake Kit, Powerflex Fast Road Dogbone Mount, Full Non Res Milltek Exhaust, Forge Development Intercooler + DV system,
    340bhp Mikes Ibis BE 2012 S3...



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