Chris,
Yes, it functions the same as a radiator cap, and is under pressure. It
opens when hot to let excess coolant into the overflow tank and then, when
it cools, vacuum is created and it is sucked back.
Jerry
----- Original Message -----
From: "Chris D'Amico" <chrisdamico@YAHOO.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, February 02, 2001 6:49 PM
Subject: coolant resevoir cap

> dear list,
> is the main coolant resevoir cap (not the overflow
> res.) supposed to be a pressure sensitive type? i
> thought its main job was to allow coolant to flow to
> the overflow. i had it replaced and it seems to keep
> the system under pressure. any thoughts?
> chris.
> 89 wolfie
>
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