Use the big black hose at the bottom of the readiator. I believe your radiator has a 13mm drain bolt. I once had the bolt thread fitting let loose on the radiator and I had to remove the radiator and resolder the fitting on. My 87 300TD has a nice drain cock that you can attached a small hose to drain into a container. Same with the block drain. These Germans sometimes make thing easy.

Henry

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63 190d (sold)
69 220D (sold)
69 280SL (sold)
76 BMW 2002 (sold)
86 190E-16v (Demised at Laguna Seca Turn 9)
87 300SDL (sold)
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87 300TD 280k (sold)
95 E320W 311k
95 E320w 180k
05 C320 4matic
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2013 GLK 250 Bluetek 4MATIC 295k