Please can somebody help me.

If I leave my '99 A4 1.9 Tdi (110) parked for a few days, the coolant level
falls to well below minimum. It doesn't happen if I drive car the car every
day.

I suspected the obvious, a leak, but when releasing the cap there is a rush
of air (in/out?). I assume if there were a leak, the internal air pressure
would be the same as outside.

There is evidence of water escaping from the overflow, (white marks on looms
below). I wondered if it were head gasket going and pressurising water, but
there is no oil / water transfer.

Temp is normal on driving.

Cheers in advance,

Chris

 

Hi Chris
Could be a problem with the cap...maybe the relief valve in the
cap is faulty.
If the cap is ok you need to get your cooling system pressure tested
Hope this helps

yoda

"Chris" <cjpotter@not-this-bit.ntlworld.com> wrote in message
news:OwYlb.586$uO2.1824138@newsfep1-win.server.ntli.net...
> Please can somebody help me.
>
> If I leave my '99 A4 1.9 Tdi (110) parked for a few days, the coolant
level
> falls to well below minimum. It doesn't happen if I drive car the car
every
> day.
>
> I suspected the obvious, a leak, but when releasing the cap there is a
rush
> of air (in/out?). I assume if there were a leak, the internal air pressure
> would be the same as outside.
>
> There is evidence of water escaping from the overflow, (white marks on
looms
> below). I wondered if it were head gasket going and pressurising water,
but
> there is no oil / water transfer.
>
> Temp is normal on driving.
>
> Cheers in advance,
>
> Chris
>
>