[s-cars] Coolant expansion tank connection

[Matt twentyV]

Failure mechanism I've seen 3 different times on 3 Audis from 1991 to 2000 is that you get some coolant weeping out of the failed/ cracked nipple.  It is a slow leak that can be tolerated for a while by topping off the tank once a week or so.  The greatest evidence (besides the disappearing coolant) is usually dried clumps of coolant residue and a little moisture in the general vicinity, but you could see steam, er, water vapor, if the temperature, humidity, and lighting are right.
If these symptoms seem to fit, I wouldn't worry about any more serious problems, at least not yet.
-Matt

Robert Myers <bob at chips-ur-s.com> wrote: 
Agreed, David, but I was able to figure out what he meant.  ;-)

Now, is the escaping water vapor and/or steam under significant 
pressure or not.  Big time pressure can point to a problem while 
comparatively low pressure is basically benign.

Bob

At 03:04 PM 1/8/2008, David Kase wrote:
>Not to beat a dead horse but it is water vapor that you see.  Steam is
>invisible...
>
>Kase
>
>
>
>Jerry Scott wrote:
> > Yes you will get steam, since the water temperature is above 100C, the
> > ambient boiling point.  When the pressure is released, it will vaporize.
> > Jerry
> > ----- Original Message -----
> > From: "Alan Page" 
> > To: "Robert Myers" 
> > Cc: "s-car list" 
> > Sent: Tuesday, January 08, 2008 12:24 PM
> > Subject: Re: [s-cars] Coolant expansion tank connection
> >
> >
> >
> >> Bob,
> >>
> >> I assumed that if this connection was loose, then I'd get steam (just
> >> like if I opened the expansion tank cap, right?
> >>
> >> Maybe I've got bigger problems...
> >>
> >>
> >>> My question, though, is why was it blowing steam?  Possible blown
> >>> head gasket?
> >>>
> >>> Bob
> >>>
> >>>
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