Actually antifreeze does not cool as well as straight water.
I install a bleeder (rad drain fitting) into the impeller cavity as vertical as possible solves the issue.^^^^^^^. Yes, seen many of those bathtub rings. One work-a-round for vacuum filling of the cooling system is to jack up the front end of the car (safely and securely) and fill the radiator with the engine running until it gets hot and starts to overflow the open cap. That's the only other way I know of to get the maximum amount of coolant in the engine without a vacuum.
Antifreeze raises the boiling point, increased temperature increases cooling efficiency plus the antifreeze additives reduces corrosion. For everyday passenger vehicle anti freeze/coolant is considered to be worthwhile. In many cases engineering involves compromise/mixing of factors, one of which is cost.Actually antifreeze does not cool as well as straight water.
I just replaced my neighbor's timing cover on his kid's 2006 Taurus 6 cyl. It started dripping coolant on Thu for the first time, fortunately while it was home here in Ia from college in KC! I pulled and replaced the aluminum timing cover as it was completely eaten away around the coolant passages. The car only had 130K on it! Then yesterday he brought over his wife's Caravan which also started leaking coolant. I'll be darned if we didn't find the exact same thing- the timing cover leaking! I guess I know what I'll be doing tonight...:shrug: