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Originally Posted by Mister Byrnzoil
I've got green in mine, As soon as the temps get warmer for a day, I'm gonna change it. I want to drain it, fill with plain water, drive for an hour, drain again, maybe use a Radiator flush product, flush with water again, then fill w/ MBZ coolant + distilled water.
any thoughts?
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The citric acid flush usually isn't needed unless you are having cooling issues, and/or know there are deposits built up. What I like to do is this:
1) With the engine COLD, drain the radiator AND engine block, then disconnect a heater hose or two and stick a garden hose into various hoses with the drains open. This gets probably 95% of the old stuff out.
2) Either close up the drains and fill with MB coolant, or use a flush to do extra cleaning (if needed). If you do this step, it becomes more time consuming to flush afterwards, as you either need to wait for the engine to cool before the garden hose treatment, or flush with hot water (not possible for some people).
3) The flush for citric acid is more critical and requires flushing, refilling, getting engine to operating temp for ~15 minutes, and repeating at least twice!! It takes practically all day (BT, DT).
4) When re-filling, DO NOT start the engine until you can feel liquid in the upper radiator hose, same as before you drained the system. Some people like to fill the block through the hose and then quickly connect it to the radiator. Some engines (like the M119) are horrible to 'burp', some require patience (OM603), some are relatively easy (OM617, I think) and some even have a handy bleed screw (M103).
Putting cold water (i.e. from the garden hose) into a warm engine is a formula for a cracked head or block, don't mess around with that.