Gonz, i drain all the coolant that i can first then just go at it, there is not much residual coolant an it gets diluted by the water and ends up coming out cleaner than you'd expect.
Don, there is a bleeder valve to remove air from the cooling system. The coolant oxidizes and can gunk up the tubes in the radiator.
I am a maintenance nazi. everything must be kept tip top or else.
oh and i change the brake fluid so often because i use dot5 fluid and its an excuse to play with my phoenix injector
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