tabe,
    Make sure you have a few buck in case you need to
visit
http://busdepot.com/details.jsp?partnumber=068121253E
Citric acid can be purchased at a hardware store and
it a weak acid so it may eat your radiator if it is in
bad shape.   It is a way of forcing you to buy what
you really need, a new radiator.
   But if your radiator is just plugged and in good
shape than dissonnect the two big pipes at the engine
end and force hot water through the pipes under
pressure.   Both directions.   Plug the ends of the
hose and introduce the magic citiric acid by way of
the radiator bleeder.   Allow to cook for a week.
Repeat the hot water flush.
   I also suggest the orange coolant because it is
organic based and I find it has somewhat of a
detergent effect.  The citric acid will either help or
make your radiator leak.  keep it cool, gary
Date:    Wed, 13 Jul 2005 00:31:42 -0400
From:    tabe johnson <xtabe@YAHOO.COM>
Subject: Citric Acid Radiator Fix

Yes, summer is here (finally!) and we can have
the annual overheating and air conditioning
discussions; in the winter we can talk about
snow tires, hard starting, and blowing oil cooler
O-rings.

Count me in for the overheating!  (I'll be getting
my pyrometer in the mail any day now so I can see
what's going on with my system.)

So, 500g of Citric Acid in 1 gallon of water
will do... what?  (I'm not doubting, just asking)
Does the water come out all icky and black or what?

I was trying to figure out a quantitative way of
measuring how clogged a radiator is.  The only thing
I could come up with was filling a radiator with
water, then dumping it out and seeing how long it
takes.  Anyone have a better idea?

tabe johnson/87 westy

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