Carbon in the combustion chamber would indicate faulty fuel/air mixture or
impurities in the gas.  This may be related to your blowing out problem - if
the flues don't seal properly to provide equal airflow, then the flame will
go out while driving.  I would imagine that this could cause problems with
the combustion mixture while stationary as well.

I have heard stories of people sealing the mating surfaces of the flue/vents
to the body with a heat-resistant RTV-type compound and having success with
the blowing-out problem.   Just make sure you do it so that you can remove
it again when you need to!  :"-)

Brent

----- Original Message -----
From: "Karl M" <THEWESTYMAN@MINDSPRING.COM>
To: "Syncro list" <syncro@yahoogroups.com>; "Vanagon list"
<vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, May 22, 2002 5:28 PM
Subject: [Syncro] Dometic Fridge experts: help!

> Hey all,
>
> Before I left for a campout last weekend, I cleaned the burner in my
> Dometic, and found granules of carbon lying in the enclosure. The flame
> visible in the little sight glass was reddish in colour before I cleaned
it,
> and after was blue again. The pilot indicator LED was brighter too. Well,
> today I noticed the LED dimming again, ad sure enough, the flame looked
> reddish again. Blew through the tube with compressed air, and it's blue
> again! Question: What could be causing the carbon buildup? Pressure too
> high, too low? The fridge seems to cool ok, but then it is only 70 here.
> Another symptom: lately: the flame will blow out while driving, it never
did
> in the past. I'm headed out to another campout, please pmail me if you
have
> any ideas. Thanks!
>
> Karl Mullendore
> Westy Ventures
> 1987 Westfalia Syncro 1.9TD
>
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