Date registered: Apr 2007
Vehicle: 2001 SLK 320(178K Miles), 2002 E320 Special Edition(156K Miles)
Location: South Bay Area,L.A., CA
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I always do this with the engine warm so that the thermostat is also open for better drainage. Also ensure that the heater control are set to maximum temperature so that the duo valves are open for draining from the heater core. Now I do have a different engine (320) and on mine I can remove the drain plug and no water will flow out as long as I keep the cap on the overflow bottle screwed on. I then position my container, open the cap on the overflow tank and get a fast outflow. To ensure the overflow container empty completely, I blow into the tank.
Also, I park with the rear slightly higher than the front, maybe 1 to 2 inches. On my last coolant change, I measure the amount drained at 10 quarts - out of a system total of 11 quarts. For that reason I did not bother with the drain-cocks on the engine, but just filled it with distilled water, warmed it up, drained and repeated.
Also, remember to re-check the coolant level over the days following. It takes a couple of days to get all the air out of the system. Remember to use the heater so that any air there is forced out as well.
Only two thing are infinite, the universe and human stupidity, and I'm not so sure about the former.
Honest politicians are like UFOs. Most people believe that there must be some out there somewhere, but nobody has yet been able to prove their existence.