Some how i cant find the drain the plug for the radiator... Im planning on flushing the whole system, thus the need for the drain plug location. do i have to remove all of the plastic covers underneath?

 

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.