who is your mechanic? sounds like you're having better luck with mechanics
than the other guy is.

>From: Karl Wolz <wolzphoto@WORLDNET.ATT.NET>
>Reply-To: Karl Wolz <wolzphoto@WORLDNET.ATT.NET>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: 4th heater core burst in 1 year!
>Date: Fri, 29 Jun 2001 15:12:32 -0700
>
>Paul,
>
>I had the same situation just this week.  I had blown two hoses in two
>days.
>
>My mechanic used the exhaust gas analyzer to find hydrocarbons in the
>cooling system.  He then did a cylinder leakage test, blowing air into each
>cylinder, till he found the one that passed air into the cooling system.
>This told us where to look for the problem once the head was off.
>
>I don't know why a radiator shop would have these capabilities, but any
>mechanical shop that does emissions analysis should be able to help you.
>
>Karl Wolz
>
>----- Original Message -----
>From: "Paul Cavanaugh" <phonyexpress@IWAYNET.NET>
>To: <vanagon@GERRY.VANAGON.COM>
>Sent: Friday, June 29, 2001 3:04 PM
>Subject: Re: 4th heater core burst in 1 year!
>
>
> > Thanks Rico!
> >
> > I replaced the expansion tank cap today, hoping to avoid future
> > trouble until I can get this diagnosed. I am getting a lot of folks
> > suggesting head or head gasket leakage. Your explanation seems very
> > likely; a big thanks for the idea to take it to A RADIATOR SHOP!
> > Never thought anyone can test for combustion gassis in the cooling
> > system!
> >
> > This is my first week on Vanagon.com and I really appreciate the help!
> >
> > Sincerely,
> > Paul Cavanaugh
> > Columbus, OH
> >
> >
> > >This overpressurization of the cooling system is likely caused by a
>failure
> > >of the sealing ring at the top of the cylinder or a leak in the
>cylinder
> > >head.  This would allow combustion gasses to enter the cooling system
>and
> > >destroy the components you mention.  Take the van to a competent
>radiator
> > >shop and have them test the coolant for the presence of combustion
>gasses
>in
> > >the cooling system.  This happened on my 84 and it ruptured the rear
>heater
> > >core and one of the heater hoses.
> > >
> > >Rico Dagastino
> > >Munford, TN
> >
> > --
> > '90 Vanagon (180k)
> > '84 Vanagon (217k)
> > '78 Microbus (175k)
> >

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