the only rubber gasket associated with the overflow bottle by the license
plate is the black rubber gasket for the cap.
  I wouldn't even know if Bentley shows it.

sealing of that cap is not critical or seriously needed, unless, due to
expansion from heating of the coolant the level rises above the bottom of
the cap opening.
It's not a pressure cap or anything like that.
I fill mine................. since waterboxers commonly use a tiny bit of
coolant out of that bottle..
like a small cup a month often............I fill to the bottom of the cap
opening cold.

the level will rise above that warmed up of course.
If it's hot enough, like 105 F on a summer day ..
enough coolant will be pushed into the overflow bottle to cause coolant to
come out the vent on the top of that bottle ...which is no big deal if you
know that's all it is.

perhaps glue the gasket into the cap if it wants to fall out of place.

Scott
www.turbovans.com
----- Original Message -----
From: "Michael Sullivan" <sandwichhead@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, December 08, 2010 1:15 PM
Subject: Re: Coolant Tank and Gasket

> I'm gonna check the Bentley ans see where the gasket came from.  Thanks.
> Michael in San Antonio
> 91GL Weekender AT 2.1L 'Gringo'
>
>
>
> On Wed, Dec 8, 2010 at 12:03 PM, Gregory Smith
> <gfs@gregoryfsmith.com>wrote:
>
>> The coolant reservoir behind the license plate has a rubber gasket on
>> the *inside* of the cap.  This keeps the coolant from draining out the
>> cap threads when things really heat up and the level is above the cap.
>> The protrusion on the top of the tank has holes in it for venting, so no
>> worries there.
>>
>> I left this cap a little loose once, not sure how, but was terribly
>> worried when I saw some coolant on the ground last summer.  Tightened
>> the cap and all is well.
>>
>> Gregory Smith
>> Smith Design Studio
>> Small Building Company
>> Olympia, WA
>> 360-239-0429
>> gregoryfsmith.com
>>
>>