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Losing coolant

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by Macdoon, Nov 30, 2013.

  1. Macdoon
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    Macdoon Active Member

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    This is driving me mad, trawled soooo many threads........

    Losing coolant (slow loss), no external leaks (pressure test done), so obviously it's going somewhere.
    Anyone else had this- my mate is thinking possible EGR cooler internal leak.

    Short of waiting for it to get worse, I'm at a loss.


    Still got the smoking/ rough idle issue from cold start until run up to temp.
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  2. Avnt
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    Avnt Member

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    Could u pressure the system to show any leaks?

    Should really have read the pressure test done thing. 😑
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  3. bez101
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    bez101 Yorkshire & Humber Rep. Regional Rep

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    read his post hes had that done
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  4. lynallbel
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    lynallbel Member

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    Read his post hes noticed he said that:whistle2:
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  5. dpaz
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    dpaz Member

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  6. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    sounds like a porus head/ leaky gasket or similar, that'd cause all of your issues inc rough cold start.
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  7. lynallbel
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    lynallbel Member

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    Second k-seal ive used it a few times and its worked, in one case the rad is still water tight over 4 years later!
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  8. Macdoon
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    Macdoon Active Member

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    Not that I know much about engines, but would this be indicated on a dye & pressure test?
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  9. Big Al
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    Big Al A4 2.0T FSI Quattro

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    Check the turbo coolant lines? My TFSI had small leaks but because of the turbo heat, it was being burnt/evaporated off leaving small residues only. Good luck with the fix!
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  10. Macdoon
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    Macdoon Active Member

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    Cheers Al, every idea and bit of info helps
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  11. Macdoon
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    Macdoon Active Member

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    Update..... looked into this issue more thoroughly, turns out that there has been a known issue with early EGR coolers, Audi have revised the cooler a couple of times. So... no obvious signs of water anywhere around the engine bay. No pool of water under car in the morning. Losing about 1 litre of coolant every 2 days. Rough idle on cold start and smoking. Took the EGR valve apart, full of sludge again, only cleaned out just over a year ago, this time tho' the soot was damp, so water must be getting through. New EGR cooler ordered, £275 grrr
    #11

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