Losing coolant

Macdoon · Nov 30, 2013

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.

Avnt · Nov 30, 2013

Could u pressure the system to show any leaks?

Should really have read the pressure test done thing. ð

hades- · Nov 30, 2013

read his post hes had that done

lynallbel · Nov 30, 2013

bez101 said:
read his post hes had that done

Read his post hes noticed he said that :whistle2:

dpaz · Dec 1, 2013

Could try K-Seal (or similar). I know VW tech's use it themselves. It's a solution that you add to coolant and it repairs and slight leaks in the system.
How does K-Seal work? - Stop, fix and repair coolant leak

Broken Byzan · Dec 1, 2013

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

lynallbel · Dec 1, 2013

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!

Macdoon · Dec 9, 2013

Broken Byzan said:
sounds like a porus head/ leaky gasket or similar, that'd cause all of your issues inc rough cold start.

Not that I know much about engines, but would this be indicated on a dye & pressure test?

Big Al · Dec 9, 2013

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!

Macdoon · Dec 9, 2013

Cheers Al, every idea and bit of info helps

Macdoon · Dec 14, 2013

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

A4_MaJiK · Nov 10, 2014

Did the cooler replacement sort this issue? I'm getting white smoke on idle but only when engine is warm. Thinking it may be the cooler as the cooler is bypassed on cold start.

Mike_B · Nov 13, 2014

I know you said you have done a pressure test, but check the header tank cap - there's an O ring on the centre, screw in, bit which had failed on mine. Also, the tanks themselves fail - on mine, even with a new cap it still blew coolant as the hole had expanded a bit and was allowing coolant thro. £30 or so for both parts and a 10 min job to replace the tank.

unitzero · Nov 13, 2014

A4_MaJiK said:
Did the cooler replacement sort this issue? I'm getting white smoke on idle but only when engine is warm. Thinking it may be the cooler as the cooler is bypassed on cold start.

May be best to PM him as this thread is almost a year old and the chap has a B8 now so may not see your reply.

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Losing coolant

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