If you really have an over cooling problem, you most likely have a bad
thermostat.
Over cooling going down long hills is caused by the fuel being cut off and
air still pumping through the engine along with any heat being removed from
the heater cores.

Dennis

>From: Geza Polony <gezapolony@SBCGLOBAL.NET>
>Reply-To: Geza Polony <gezapolony@SBCGLOBAL.NET>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: No more overheating!
>Date: Thu, 6 Sep 2007 22:49:18 -0400
>
>The cooling system in Vanagons is actually quite capacious, as if VAG was
>atoning for its sins with the aircooled buses.
>
>You may in fact find over-cooling to be the problem if you drive in
>freezing
>weather, especially downhill for a long ways. There are those who put
>cardboard over the radiator to circumvent this.