there's only one bleed valve on the rear heater core.
It has one o-ring on it I believe.
I seldom put o-rings together dry .........they leak after a while in my
experience.
I use a very high quality black silicone, but a tiny bit, on cooling system
o-rings.
I use Toyota stuff, but a good high quality silicone will be good too.

----- Original Message -----
From: "mordo" <helmut.blong@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, October 26, 2008 1:54 PM
Subject: Rear Heater Core Cover Removal

> Hey, this reminds me of a questions I have.
> Does the valve require just one O-ring?
>
> How many bleed screws does the core have and do they need to be replaced
> routinely?
>
> cheers,
>
>
> ---------- Forwarded message ----------
> From: Jim Johnston <inmytree1@gmail.com>
> Date: Sun, Oct 26, 2008 at 2:09 PM
> Subject: Re: Rear Heater Core Cover Removal
> To: vanagon@gerry.vanagon.com
>
>
> Thanks for the input, y'all.
>
> and Thanks to Mr. Dremel and his sweet little tool, the box has been
> modified.  As it stood, the bar that goes across under the seat prevented
> me
> from just sliding the cover out.
>
> With everything apart.  It looks like the valve is leaking.  The core,
> while
> dirty, looks ok.  I'll be ordering a valve and o-ring today.
>
> Jim
>
> On Sun, Oct 26, 2008 at 1:58 PM, Larry Alofs <lalofs@gmail.com> wrote:
>
>> It's been a few years since I did this, and of course I'm not looking at
>> mine right now, but...
>>   As I recall, what you want to do is modify the case a little.  I
>> believe
>> you take a hacksaw blade or similar impliment of destruction and make a
>> vertical cut at the bottom at each side so as to remove the strip that
> goes
>> along the bottom front of the core.  Thenceforth the case can be removed
>> without much hassle.
>>
>> Larry A.
>>
>>
>>
>> On Sun, Oct 26, 2008 at 11:44 AM, Jim Johnston
>> <inmytree1@gmail.com>wrote:
>>
>>> Vehicle: 1991 Vanagon GL
>>> Location: Wilmington, NC
>>>
>>> Hello all,
>>>
>>> My rear heater core has sprung a leak.  In looking at getting to the
>>> core
>>> and valve, It seems that I have to remove the rear bench because the bar
>>> is
>>> blocking the removal of the cover.  I just wanted be sure that is the
> case
>>> before tearing things apart.
>>>
>>> Jim
>>> Wilmington, NC
>>>
>>
>>
>
>
> --
> Jim
> Wilmington, NC
>
>
>
> --
> mordo
> 1990 Carat