Drain the Radiator?
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There is no drain plug, you'l have to loosen a hose clamp. Once flushed and re-filled with 50:50 premix, you'll have to be sure to purge all air from the system, this is done when cold, usually involves lifting the coolant reserve jug higher. Bleeder valve in T (#11 in drawing) is usually fragile, many have replaced with a brass one, and replacements are like $7 at BMW dealers. You'l want to flush the heater core as well. Flow plan attached.
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