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interesting coolant stuff
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My new GM Manual sez this:
"Antifreeze can be added to raise the boiling point of the coolant, but =
too much will affect the freezing point. Do not use a solution stronger =
than 70% antifreeze, as the freeze level rises rapidly after this point. =
Pure antifreeze will freeze at -8deg F." (50-50 gives freezing =
protection down to -34deg F.)
Since antifreeze does not seem to cool as well as water, I'd say run the =
lowest concentration of green AF that your climate/time of year will =
allow. (most containers have a chart correlating concentrations with =
temp protection)
Larry
----- Original Message -----=20
From: ian Butler=20
To: T Berk=20
Cc: Scirocco List=20
Sent: Monday, March 24, 2003 7:03 AM
Subject: Re: interesting coolant stuff
On Mon, 24 Mar 2003, T Berk wrote:
> It's SILICA that is abrasive in old style coolant, it rubs seal to
> death and is prob. the main cause (right up there with stiff belts
> drawn too tight) of weepy waterpumps.
> Check the label of the orange stuff next time; silica free. Prob.
> partly the reason the orange stuff seems to creep out around hoses =
and
> cause that scabby crust as well.
I believe Dex and other long-life coolants have special detergents =
that,
more or less like synthetic, have a tendency to "clean things up", =
which can
involve removing gunk that's keeping the system from leaking.
More importantly, though, green antifreeze contains phosphates, and
phosphates eat aluminum. It's not a big deal in inline cars like
Sciroccos, but it's a *huge* deal in Vanagons, where coolant sits in =
the
heads, seeps under the gaskets, and pits/rusts its way right through =
to the
ground. Such a serious and expensive problem on those that a lot of
prospective Vanagon buyers won't touch a bus with green coolant in it.
It hasn't concerned me enough to immediately replace the green coolant =
in my
'roc (not that I've had the stupid thing since November anyway.. =
grumble)
but it's about due for a flush, and it'll get Dex when I fill it =
again.
> btw- Yep, water conducts better than coolant, 70/30 water to coolant
> seems like a good nominal minimum.
I believe 70/30 is minimum and 30/70 is maximum. Supposedly if you go =
above
30/70, the hot light says "Hello, too much antifreeze!" but I haven't
checked...
ian Butler / ian@bluemoon.hplx.net
'88 Scirocco 16v, '87 Vanagon Syncro GL
_______________________________________________
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<DIV><FONT face=3DArial size=3D2>My new GM Manual sez this:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>"Antifreeze can be added to raise the =
boiling point=20
of the coolant, but too much will affect the freezing point. Do =
not use a=20
solution stronger than 70% antifreeze, as the freeze level rises rapidly =
after=20
this point. Pure antifreeze will freeze at -8deg F." (50-50 =
gives=20
freezing protection down to -34deg F.)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Since antifreeze does not seem to cool =
as well as=20
water, I'd say run the lowest concentration of green AF that your =
climate/time=20
of year will allow. (most containers have a chart correlating =
concentrations=20
with temp protection)</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Larry</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:ian@bluemoon.hplx.net"; =
title=3Dian@bluemoon.hplx.net>ian=20
Butler</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
href=3D"mailto:tberk@mindspring.com"=20
title=3Dtberk@mindspring.com>T Berk</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A=20
href=3D"mailto:scirocco-l@scirocco.org"; =
title=3Dscirocco-l@scirocco.org>Scirocco=20
List</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, March 24, 2003 =
7:03=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: interesting =
coolant=20
stuff</DIV>
<DIV><BR></DIV>On Mon, 24 Mar 2003, T Berk wrote:<BR><BR>> It's =
SILICA that=20
is abrasive in old style coolant, it rubs seal to<BR>> death and is =
prob.=20
the main cause (right up there with stiff belts<BR>> drawn too =
tight) of=20
weepy waterpumps.<BR><BR>> Check the label of the orange stuff next =
time;=20
silica free. Prob.<BR>> partly the reason the orange stuff seems to =
creep=20
out around hoses and<BR>> cause that scabby crust as well.<BR><BR>I =
believe=20
Dex and other long-life coolants have special detergents that,<BR>more =
or less=20
like synthetic, have a tendency to "clean things up", which =
can<BR>involve=20
removing gunk that's keeping the system from leaking.<BR><BR>More =
importantly,=20
though, green antifreeze contains phosphates, and<BR>phosphates eat=20
aluminum. It's not a big deal in inline cars like<BR>Sciroccos, =
but it's=20
a *huge* deal in Vanagons, where coolant sits in the<BR>heads, seeps =
under the=20
gaskets, and pits/rusts its way right through to the<BR>ground. =
Such a=20
serious and expensive problem on those that a lot of<BR>prospective =
Vanagon=20
buyers won't touch a bus with green coolant in it.<BR><BR>It hasn't =
concerned=20
me enough to immediately replace the green coolant in my<BR>'roc (not =
that=20
I've had the stupid thing since November anyway.. grumble)<BR>but it's =
about=20
due for a flush, and it'll get Dex when I fill it again.<BR><BR>> =
btw- Yep,=20
water conducts better than coolant, 70/30 water to coolant<BR>> =
seems like=20
a good nominal minimum.<BR><BR>I believe 70/30 is minimum and 30/70 is =
maximum. Supposedly if you go above<BR>30/70, the hot light says =
"Hello,=20
too much antifreeze!" but I haven't<BR>checked...<BR><BR>ian Butler / =
<A=20
href=3D"mailto:ian@bluemoon.hplx.net";>ian@bluemoon.hplx.net</A><BR>'88 =
Scirocco=20
16v, '87 Vanagon Syncro=20
=
GL<BR><BR><BR>_______________________________________________<BR>Scirocco=
-l=20
mailing list<BR><A=20
=
href=3D"mailto:Scirocco-l@scirocco.org";>Scirocco-l@scirocco.org</A><BR><A=
=20
=
href=3D"http://neubayern.net/mailman/listinfo/scirocco-l";>http://neubayer=
n.net/mailman/listinfo/scirocco-l</A><BR></BLOCKQUOTE></BODY></HTML>
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