[s-cars] Coolant flushing?

[LL - NY]

Thanks Bob, I knew that the chemistry question would get an answer from ya!

On Thu, Oct 8, 2009 at 12:02 PM, Robert Myers <bob at chips-ur-s.com> wrote:

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>
> Citric acid is acidic almost in name only.  It is a very weak acid, just
> barely strong enough to taste a little sour.  It is strong enough to react
> with bases such as carbonate deposits, etc., but not harmful to either
> metals such as copper or anodized aluminum or plastic, especially in a
> limited exposure time.  It is most definitely NOT a strong electrolyte.
>  Rinse it oudathere fairly well and all will be well.
>
> Bob
>
>
>
> At 08:22 AM 10/8/2009, LL - NY wrote:
>
>> *This message was transferred with a trial version of CommuniGate(r) Pro*
>>
>> Do have any referring documentation on this, or is this just what one
>> dealer
>> guy told you?  Considering citrous stuff is quite likely acidic (mild, not
>> worried about corrosive abilities) and therefore is an electrolyte, I'd be
>> concerned about galvanic reactions during the "citrous" period. IF M-B has
>> truly endorsed this procedure, I'd assume that they've prescribed a
>> specific
>> safe time for each stage, etc.
>>
>> On Wed, Oct 7, 2009 at 11:15 PM, Brett Dikeman <brett.dikeman at gmail.com
>> >wrote:
>>
>> > 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
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