[Fixittt]

well with a open loop, U have the pump in the res, makes for filling and bleeding very easy. Also with a res U have more coolant in the system, which does help. And I never hear my pump running in my aluminum res. The draw back to this is, the pump adds heat to the coolant.

an open loop is basicly just the opposite, No heat added to the water, takes up more case space (Which I think is valuable) bleeding and filling is a pain, less coolant in the system means more maintance. More places to spring a leak and noise.

I think that covers the basics.