As mechanical as I generally consider myself, I still seem to have issues understanding cooling systems with remote expansion tanks – anyway…

06 Kodiak 450: flushed the cooling system, refilled the radiator with premix, set the expansion tank level to the full mark, and took her for a short spin down the road and back to warm her up a little. Let her cool a few minutes, and pulled the radiator cap.

Room for more coolant, so topped of the radiator, closed her up, went for a spin again, and now, while the radiator still shows it needs some more coolant, the expansion tank is overfull.

Am I supposed to ignore the air-space in the radiator, and only go by the level of coolant in the expansion tank???

Joe