I think you'd best stick to coolant flush rather than make your own. You
could do damage to seals, water pump etc making your own brew.
PS
----- Original Message -----
From: david <engstrom@tstonramp.com>
To: <spitfires@autox.team.net>
Sent: Tuesday, August 03, 1999 9:14 PM
Subject: cooling system
>
> Hello to everyone. Anyone have any thoughts or experience with
> derusting a spit cooling system with phosphoric acid? I was pondering
> filling my system with 0.1 molar phosphoric acid and running it for
> maybe 20 minutes and then letting it sit overnight, then another 20
> minute run, then 2 or 3 flushes to dilute the acid/rust out. I don't
> think the acid would do any damage but I'm not sure. My system has a lot
> of rust in it. I ran the engine at 2k rpm for a half hour and the temp
> gauge equilibrated at the center of its range, also the engine never
> felt/showed any symptoms of excessive heat. But, of course, I'm
> concerned about local hot spots in the engine due to local coolant
> blockage caused by rust deposits. This is a mk2 that sat for 10 years,
> and has probably never had the cooling system cleaned. Also, anyone know
> where can I obtain phosphoric acid?
>
> Thanks, David
>
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