When you do locate one, even if it is new, blow-test it before you walk out
the door so you will know it works as a one-way valve. I have bought them
new that didn't work. There is absolutely no way to repair them.

Jim

On Mon, Aug 22, 2011 at 4:02 PM, Tom Rowsell <86westy@geoexploits.org>wrote:

> Thanks Scott, of course I have no spare. I suppose plugging the hose
> outlet on that blue cap is not wise? Is the cap used on any other VW
> model just in case I find a junkyard ?
>
>
> On 8/22/11, Scott Daniel  - Turbovans <scottdaniel@turbovans.com> wrote:
> > that blue pressure cap ..
> > is my first thought.
> > They are not that reliable.  One should always carry a spare.
> >
> > right now, with no further information or test results..
> > it sounds like ..
> > either pressure cap is not holding pressure properly .....
> >
> > or cooling system pressure is abnormally high ( such as combustion gases
> > getting into cooling system at the heads or head gaskets ).
> > If you see bubbles btw...
> > rising to the surface of the coolant in the pressure bottle
> > ................unless you are in the process of just filling the coolant
> to
> > start with ..........that is not a good sign.
> >
> > if you *always* see a small bubble trail there ...
> > that's really not a good sign.
> > Have the air space above the coolant in the main pressure bottle sniffed
> > with a smog sniffer. If there are excessive HC's there ....it's a
> combustion
> > gases getting into the coolant issue.
> >  It should not do what you are descibing at all.
> > Try the cap first though ..
> > as it's so easy to do, and they are known to be a bit dodgey at times.
> >
> > Scott
> > www.turbovans.com
> >
> > ----- Original Message -----
> > From: "Tom Rowsell" <86westy@GEOEXPLOITS.ORG>
> > To: <vanagon@GERRY.VANAGON.COM>
> > Sent: Monday, August 22, 2011 11:08 AM
> > Subject: Coolant Strangeness
> >
> >
> >> This is likely an FAQ...I'm on the road and searching is awkward with
> >> cell phone.
> >> It seems when I drive for an hour or so at highway speed, and stop
> >> abruptly (to get gas for example) coolant rushes from the left tank
> >> into the overflow one on the right, sometimes overflowing that one
> >> onto the ground. In one instance the dash light began to flicker and
> >> when I pulled over, the right hand tank was full, and the left one was
> >> down 1/2 litre or so. It's not overheating, but temperature rises at
> >> idle after a highway run.
> >> 2.1 litre, recent (last 6 months) new rad, water pump. There are no
> >> evident leaks, and oil on dipstick looks clean.
> >> Any suggestions on what to check?
> >> The needle is generally parked right at the center of the LED...
> >> Thanks
> >> Tom
> >
> >
>