interesting coolant stuff

[rfkellner@snet.net (rfkellner@snet.net)]

It seems like we have run the full gamut of coolant opinions=2E  From
straight H2O to never use the green to never use the pink/orange=2E  Can
anyone point to some industry papers or independent studies?

Also, for someone that wants to run straight H2O aren=92t there plain
additives to inhibit corrosion?  If so, what is in these products?=20

Thanks, Rick K=2E  Soon to change water pump and coolant=2E=2E=2E=2E=2E

Original Message:
-----------------
From: ian Butler ian@bluemoon=2Ehplx=2Enet
Date: Mon, 24 Mar 2003 10:03:55 -0500 (EST)
To: tberk@mindspring=2Ecom, scirocco-l@scirocco=2Eorg
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=2E the main cause (right up there with stiff belts
> drawn too tight) of weepy waterpumps=2E

> Check the label of the orange stuff next time; silica free=2E Prob=2E
> partly the reason the orange stuff seems to creep out around hoses and
> cause that scabby crust as well=2E

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 c=
an
involve removing gunk that's keeping the system from leaking=2E

More importantly, though, green antifreeze contains phosphates, and
phosphates eat aluminum=2E  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 th=
e
ground=2E  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=2E

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=2E=2E grumb=
le)
but it's about due for a flush, and it'll get Dex when I fill it again=2E

> btw- Yep, water conducts better than coolant, 70/30 water to coolant
> seems like a good nominal minimum=2E

I believe 70/30 is minimum and 30/70 is maximum=2E  Supposedly if you go a=
bove
30/70, the hot light says "Hello, too much antifreeze!" but I haven't
checked=2E=2E=2E

ian Butler / ian@bluemoon=2Ehplx=2Enet
'88 Scirocco 16v, '87 Vanagon Syncro GL


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