Kurt, the Napa Block Test Kit that I use is part number BK 700-1006.  It is
on Napa's website for $42.  I highly recommend using this kit to test for
combustion gases in the coolant.  It will give you a thumbs up or thumbs
down evaluation of the condition of the engine/head gasket/ cylinder head.
 Let us know what you find out.

Ken Wilford
John 3:16
www.vanagain.com

On Tue, May 7, 2013 at 6:25 AM, Kurt Grotz <kurtgrotz@gmail.com> wrote:

> I got my 86 out from winter dulldrums and drove 200 mile trip.  Noticed
> that reserve overflow was filled and the tank itself was low.  I drained
> some from overflow (when engine was sitting overnight) and then proceeded
> to open the main coolant tank to put in more fluid.  As soon as I loosened
> the blue cap pressure started filling it up from the rest of the water
> system.  I quickly tightened it down.  When I run it - it gets low again.
>  I have never had this problem of pressure being so great that I can't just
> simply take main tank cap off.  Could this be a bad cap?  It is a newer one
> which I got because it looked newer.   Can't seem to find the old one.
>  Ideas?
>
>
> Kurt Grotz
> 484-477-2109
> kurtgrotz@gmail.com
> 86 Vanagon (Rexmobile)
> 87 Westy (Sky)
>

--
Thanks,
Ken Wilford
John 3:16
www.vanagain.com