[s-cars] Coolant flushing?

[Brett Dikeman]

On Wed, Oct 7, 2009 at 5:08 PM, RI <chewy4000 at gmail.com> wrote:

> Is there a way to completely flush out the brown out of the system?
> I changed the resevoir but some mud came back up.

Do what the Mercedes guys swear by:

-Buy a big bottle of Shout (or whatever low-suds detergent you can
find- stain treaters are low-suds.)
-Dump it in, add water, run up to temperature, let it sit for a few
minutes, drain.  This gets rid of the grease/oil buildup.
-Flush it COMPLETELY out.
-Add citric to the system (can be purchased at a MB dealer, or
possibly some commercial kitchen/restaurant supply stores) with
distilled water.  This gets rid of (I think, Bob can tell you for
sure) the coating that you get from the "green stuff", and any
corrosion.
-Run up to temperature
-Flush completely
-Fill with real Audi/Pentosin coolant (any color is OK) and distilled water.

Since Shout and citric acid do not contain anything to lubricate the
water pump, don't go for a long country drive with either in the
system or leave the stuff in for hours.

This is actually a MB-recommended procedure as part of every coolant change...

Brett