Quote:
Originally Posted by omegabenz
so all of you guys are going to clown him for asking how to perform a citric acid flush, and then you are going to hijack his thread. Whats the point?
Citric Acid flush, is useful for dislodging particles, but do you really want to run that through your water pump. If yes, then go from there.
Dump coolant, recycle it. Put in water and citric acid, run it for a little while, then dump it out, recycle it.
Flush, and then put in MB coolant with distilled water.
contact rusty cullens at buymbparts his thread has a good write up on it over there. It seemed like there was a big debate about 3-5 years ago here on mercedes shop as well.
I hope that this has ACTUALLY helped you
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A citric acid flush is used for
dissolving scale, not dislodging particles.
I recently descaled my euro 84 300TD turbo. It had enormous quantities of built up scale, really staggering.
A few weeks later, I removed the waterpump to inspect the impeller for wear (it was still running hot). Believe me, nothing was going to hurt that iron impeller.
The basic procedure is:
1) drain coolant (radiator and block drains)
2) remove thermostat
3) degrease cooling system with a detergent, flush with clean water
4) descale with 10% citric acid, flush with clean water until no acid residue remains
5) flush with distilled water
6) install new, tested, thermostat
7) refill with appropriate quantity of approved coolant (undiluted), fill with distilled water to correct final volume
There is
alot more information behind the scenes of what I've just described, e.g. "flush" means filling the system and driving it to get it up to operating temperature. The correct procedure is described in the factory service manual. If you want to do it without the FSM, you really will need to search the archives.