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turbodiesel,
I am not sure about the exact configuration of your radiator, but the 240D has a small plastic threaded plug on the bottom on the driver's side. When you unscrew it, the plug drops down an inch or so but has a lanyard to hold in the hole (it does not come off in your hand). I imagine this is similar on your car. When you open this drain plug, most of the coolant will come out (take the cap off the expansion tank too and set the heat controls to full heat on - with the car running in your case as this is all done by actuators that do not respond when car is off - the 240D has a mechanical actuator connected to the temperature selector knobs in the car). The 240 has no expansion tank, the cap to fill the system is right on the radiator so you just run the garden hose in the top of the radiator.
If you run water in the expansion tank the fill line to the system should carry it into the block and the radiator should fill up without taking the thermostat off. I reinsert the radiator plug, let the system fill, drain it out, repeat until it looks clean and feels clean. With antifreeze in there it ususally feels a little slippery.
Then I do the same thing except with the block plug. Once the system is pretty clear, I run the car to normal operating temp with just water in it and drain it out again. When I use the citric acid stuff, I add that at this point when I refill the system, run the car for a good half hour at temp, and drain and flush a few more times. Then I refill the system with the antifreeze and water wetter. I usually try to do this with the car nose aimed uphill (I have a small hill in my yard) so the air will not get stuck in the head, or the heater circuit as I am filling it. Hope this helps, Jim
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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles
Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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