Why BMW 3 series overheating?

I believe that the late-eighties/early nineties 3-series 4-cyl engine design permits an "airlock" or air bubble to lodge in the water jacket after collant has been allowed to drain. This airlock prevents circulation of coolant in the block, raising the block temperature rapidly after starting. Because there is no apparent loss of coolant, the source of the problem is not at first obvious. My only solution is to remove the upper radiator hose from the radiator and insert the tapered end of a wet/dry shop vacuum hose. With the engine running and the thermostat and the radiator filler cap open, turn on the vacuum to draw coolant out the upper hose while simultaneously pouring in coolant through the fuller neck. This while take an indeterminate amount of time. The main thing is to not let the coolant level in the radiator fill reservoir drop. Anyone else have this problem?