Daniel;
        Temperature has nothing to do with it (directly), the cap works
on pressure. They have been known to go bad so just replace it. If
nothing else you will have a spare.
        If you really wanted to do the preventative maintenance thing
replace the reservoir also. It comes with a new cap. The reservoirs fail
by developing cracks. New tanks are translucent, aged units are opaque
with white patches  that are hard and brittle. I would spring for a new
coolant level sensor, another failure item.
        Well I better stop here, like usual, my projects spiral out of
control. #%-\

Drive Safely & Good Luck
Ken Lewis    <Kernersville,NC>
86 VW crewcab;60 356B Coupe
--------------------------------------------------

On Mon, 7 Aug 2000 10:28:45 -0700 Daniel Schmitz <djs@gene.com> writes:
>Re my cooling system problems:
>
>Brought the van to operating temp, let it run for awhile, looked
>everywhere for leaks, saw none. Water level in expansion tank rose a
>bit, overflowed properly into fill tank. Upon cooling down, water
>level
>in fill tank receded to just above 'high' line. So the pressure cap is
>doing it's job, just not clear if it's doing it at the right
>temperatures. The pressure cap is the 'blue' type, but I don't know
>how
>old it is. I'm thinking of replacing just as preventative maintenance,
>though.

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