Date: Tue, 27 Apr 2004 08:51:01 -0700
Reply-To: gary hradek <hradek@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: gary hradek <hradek@YAHOO.COM>
Subject: Re: coolant system trivia
In-Reply-To: <000901c42c07$3f24b520$0d64a8c0@Thor>
Content-Type: text/plain; charset=us-ascii
Jere,
Flushing the radiator had done major benifits to
the coolant system. The process of flushing has made
me aware of how much friction affects the flow rate
when the radiator is up front and the engine is in the
back. I suspect the flow rate of water alone is more
than two times that of a 50:50 mixture.
So I wonder what would happen to that high speed
fan that keeps kicking my AC off in hot weather if I
could increase the coolant flow?
just a thought, gary
--- Jere Hawn <jbrschawn@earthlink.net> wrote:
> Hi Gary,
>
> I am no expert on the cooling system only years of
> trials and tribulations.
>
> I would first ask how did you get there, have you
> owned the van and it
> slowly acquired this problem or is this van new to
> you and you are trying to
> correct a perceived problem....
>
> From my own van's experience when I replaced the
> original thermostat and my
> van started running quite a bit hotter. This is my
> first summer with the
> new thermostat. If it continues to run hot I plan
> to get the other
> thermostat (there are two I think one is 89 deg ant
> the other is 82 deg C)
>
> The viscosity is higher with the antifreeze which
> explains it lower flow
> rate but your seems to be much lower. I would ask
> is there a blockage
> somewhere else in the engine? Is the system
> completely bled out per master
> Bentley?
>
> I'd look at the thermostat, bleed it and then road
> trip it for about 100
> miles and then flush it... it sound like something's
> in there
>
> Jere
>
> -----Original Message-----
> From: Vanagon Mailing List
> [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> gary hradek
> Sent: Monday, April 26, 2004 9:12 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: coolant system trivia
>
> I have been dealing with a conditon that I believe
> to
> be a plugged radiator. I have ruled out most other
> cheaper fixes. Over the past week I have isolated
> the radiator at the point of the rear most end of
> the
> big pipes and plugged them with corks and soaked the
> isolated system with 0.2M citric acid for a week.
> Flushing the system with hot water under house
> pressure gave a flow rate about 6 gallons per
> second.
> The first flush was very black and showed evidence
> of
> bits of aluminum from what I am hoping to be some
> after market sealer rather than the radiator itself.
> After flushing the system I filled with the orange
> stuff. What I find intersting about the vanagon
> coolant system is that the flow rate for water alone
> is much faster than with antifreeze added. This is
> reflected well by the (temperature at idle as seen
> by
> the gauge) TAI.
> The TAI with water alone is much lower and at
> position
> determined by the thermostat. The low speed fan
> has
> no problem keeping the engine temperature on the red
> light dot even on a very hot day. Once you add
> antifreeze the TAI goes up above the light unless
> you
> increase the rpm. The TIA on a hot day(about 95)
> will respond more slowly to the cooling affect of
> the
> low speed fan.
> My question is would I be better off adding less
> antifreeze and more water and perhaps adding some
> after market corrosion inhibitor and water pump
> lubricant? thanks gary
>
>
>
>
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