how about this...
lets say the flow is from the pump -> rad -> WB ->T-fitting (where it goes up to your res or fill line, and down to the pump).
how about putting a valve between the WB outlet and the T-fitting? that way when you turn the valve, the coolant will flow out there, and you use the res / fill line to put fresh coolant into the system. would that work? it would certainly be easier (and wouldnt make a mess) than having to pull a hose off somewhere...
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