Date: Thu, 4 Mar 2004 04:03:20 -0500
Reply-To: "Daniel L. Katz" <katzd54@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: "Daniel L. Katz" <katzd54@YAHOO.COM>
Subject: Re: Purging Cooling System of Air / Where Would We Be Without
This Topic?
con't from last post
and, proposed method, like any good scientific theory, can be proven
false. if anyone does this, please follow with standard bleeding method,
see if there is any remaining air, and report to list.
dlk
On Thu, 4 Mar 2004 03:49:06 -0500, Daniel L. Katz <katzd54@YAHOO.COM>
wrote:
>interesting. seems like a reasonable approach for initial fill. but isn't
>the tall filling reservoir in back coupled with open vent in front just
>another artifice for providing a pressure difference?
>
>i would be surprised if this method alone purges all the air.
>
>
>>Don't waste your time: the thermostat housing gets filled from both
sides.
>>Anyway, if it needed a weep hole, you can rest assured that VW would have
>>punched one in the thermostat plate.
>>
>>All these suggestions to put pressure or suck on the coolant system when
>>filling it demonstrate a lack of understanding about what is happening.
>Looking
>>under a Vanagon will reveal the tortured route the coolant lines have to
>>follow. The facts of life in this scenario are that air is less dense
>than water
>>and air is a compressible fluid while water is an incompressible fluid.
>There
>>are several places in the coolant system where air pockets can form which
>will
>>be unrelenting and sorta invisible to any pressure or vacuum they might
>see.
>>
>>The solution I found to purging ALL the air from the coolant system is to
>>rely on the laws of nature which rule the palpable universe. First, get
>the van
>>up at the front at least the height VW specifies. Jacking the van to
this
>>height can be risky for the average shadetree type, but, finding a
>suitable
>>gradient to avoid hoisting the van is not impossible. Looking around
>armed with
>>some mason's twine and a line level should reveal one.
>>
>>Secondly, install an additional vent at the highest point of the system.
>>
>>Thirdly, at the rear of the van, connect a temporary filling reservoir
>well
>>above the elevation of the highest point in the system.
>>
>>There are some other minor things which make the job a little neater to
>do,
>>but are not essential such as attaching another temporary reservoir to
the
>>radiator vent.
>>
>>George
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