Could you please clarify something I read in the Haynes manual. Re 300ce,it said to set the heater at full temp, disconnect the lower rad hose at the radiator & run the garden hose into the upper rad hose (thermostat removed) until the lower hose drained clear water. It said nothing about running the engine, so I assumed that wasn't necesssary. So, is the heater running off the battery alone? Once the drained water is clear, should the block be drained again & filled with antifreeze mixture, or should antifreeze just be added? I have never done this & don't want to mess up after I was able to replace the radiator from what I learned on this board & in Haynes. 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)