A = pump
B = left heater matrix hose connects here
C = nub on block for right heater matrix hose (not shown)
D = end of plasitc main artery, radiator lower hose connects here
E = connection to lower inlet manifold
Ok thats the information out the way, what i'd like to know is, does the water pump suck along the big plastic main artery in the direction of the red arrow, or, does it pump along the plastic artery in the direction of the blue arrow.
My money is on red arrow, purely because the pump would be trying to force water into the radiator lower hose otherwise. I'm just trying to find out, in a round abouts way, which is the feed and which is the return to the heater matrix. I think C is the feed, and B is the return.