In cleaning Heat Exchangers I just fill them with kerosene / gunk cleaner
mix and let them leak out the solvent.
I then run a garden hose into either end and just flush them really good.
After they've heated a few times with the tubes disconnected they will loose
the solvent smell and you can put your flapper boxes back on.

Stan Wilder
Engine Ceramics
214-352-4931
www.engineceramics.com
----- Original Message -----
From: "Jonathan Poole" <jfpoolio@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, December 28, 2004 9:28 PM
Subject: Heat Exchanger Clean-out and BusDepot Thermostat

> Hi Listees,
>
> I am doing a bit of tuneing etc. on my '82 air cooled vanagon and have
> a couple of questions for ya'll.
>
> Does anyone have a technique for cleaning installed heat exchangers?
> Mine don't seem to be too dirty and they heat really well but there is
> a bit of an oily smell when the engine gets really warm (currently no
> oil leaks above/into heat exchangers).  I have planned to remove
> enough ducting to be able to spray the air passage with a steam
> cleaner, is this an awful idea?
>
> Does anyone have experience with the Bus Depot replacement
> thermostats?  I am having trouble determining if my current
> thermostats 6mm of expansion/contraction is enough so I thought I'd
> just replace it but I have heard that most new thermostats are very
> proned to fail.
>
> Thanks all,
>
> Jonathan Poole
>
>
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