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Date:         Sun, 24 Mar 2002 21:17:24 -0600
Reply-To:     John Rodgers <jhrodgers@MINDSPRING.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Rodgers <jhrodgers@MINDSPRING.COM>
Subject:      Re: Coolant Rising Mystery
Comments: To: VW85Westy@AOL.COM
Content-Type: text/plain; charset=us-ascii

Peter Krogh wrote:

> I replaced the pressure cap as the first diagnostic proceedure. Even replace > it twice.

Peter, give the thermostat a go. The thing may not be working properly. Could be opening just the tinest bit enough to let some cooling to take place at low speed, but when driving hard it's not enough, thus preventing adequate cooling under heavier loads resulting in possible boiling in the heads.

If you have access to one of those infrared heat sensing devices that some mechanics use, you can, on an absolute cold engine start, monitor where the heating is taking place in various parts of the engine, and also tell when the thermostat begins to open. You can also get a relative reading on the themostat by watching the changing reading on the meter as the various parts get hotter and hotter as the engine continues warming up to normal operating temperature. The sensors are great for trouble shooting. First developed by NASA to read rocket engine and other component temps out on the launch pad, then addapted by the Auto Racing world, and finally adapted to the average Auto shop.

Anyway, good luck.

John Rodgers 88 GL Driver


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