I just replaced the radiator on my 88 300ce, and according to the Haynes manual ( in the regular maintenance section), engine flushing is accomplished first by draining the engine at the block & then disconnnecting the upper & lower radiator hoses & removing the thermostat, & then inserting water from a garden hose into the upper hose until it comes out the lower radiator hose & runs clear. I'm not sure what this actually means, so my questions are: First, do I run the engine after filling the block, and second, should I run the engine until clear water comes out the lower radiator hose & until all the water is out. BTW, the manual says heater should be running and set at full heat. Thanks

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)