Sounds like you have an air pocket somewhere in the system that expands
(when heated) pushing the coolant out.

Jere
90 GL
88 GL

 -----Original Message-----
From:   Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM]  On Behalf Of
Daniel Danrich
Sent:   Thursday, January 25, 2001 11:39 AM
To:     vanagon@GERRY.VANAGON.COM
Subject:        Help with coolant system

I've own my 87 GL since new and it now has 211,000 miles on it, new engine
now, never replace the radiator and I was wondering if its time to do so
because of the slow traffic/hi altitude over heating. The expansion tank
when it over heats empties into the overflow tank and exposes the sensor and
the red like begins to blink. If I relive the cap on the expansion tank I
can get the coolant to suck back the expansion tank. I had to do this all
the way home the other day when I went in to hi altitude roads.
Any help will be appreciated
Dan