Folks, I just got my AC fixed after being without all summer down here in toasty Houston, TX. I'd like to flush out my radiator tomorrow, and was wondering if there was any kind of priming or bleeding in the coolant system in my 1983 300D? I distinctly remember on my old 1979 240D I had to bleed the coolant system by unscrewing a bolt until antifreeze came out. Is there anything like that on the 300D, or can I just empty out the radiator, flush it gently with water, then fill it back up again? Thanks so much in advance for your help!