I haven't seen those types of radiator deposits, but I wonder if the cooling
system is filled with unfiltered well water.

Radiator shops used to routinely take a tank off and slide cleaning rods
thru the core tubes. That's when radiators were all metal parts. The plastic
tank models aren't as easily repaired with the usual practices of the old
standard of soldering parts together.
Calling a shop will determine if they will do that, and the approximate
cost.

Compare the service/repair costs of a used radiator to the cost of a new
one. The last new one I bought about 5 years ago was about $100. It wasn't
marked made in USA, and I suspect that it was imported.
It is assembled with soldered joints, no plastic tanks.

WB
................

"Martin" wrote in message
oups.com...
Looking at a vehicle with a cooling problem, I found the radiator to
contain these rough deposits which resemble the lime/calcium deposits
found in showerheads:


http://pg.photos.yahoo.com/ph/funkyc...07.jpg&.src=ph

The true color is actually a little more white and a little less brown
than it appears here. The texture resembles coral or concrete, with a
dry/granular nature.

There is no substantial rust in the system, only this stuff. I also
removed the lower hose, and found no crud. Also, the wire "spring"
inside the radiator hose is not rusted. The problem appears to be
confined to the upper part of the tubes.

I tried the two-part oxalic acid / neutralizer distributed by Prestone,
with no effect, so it's not limestone

Can anyone identify these deposits, and recommend a treatment? Is
there any in-situ treatment known to remove this? If not, what would a
radiator shop do I remove the radiator and take it in?

thanks,

Martin





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