In the process of bleeding the system with the coolant expansion tank cap off and bleeder screw open the expansion tank started gargling and spewing coolant/water 50/50 all over the place.

This is a result of a nearly complete drain and refill while switching out the fan. I flushed the system using the shopvac method, so I would expect a ton of air and much bleeding needed.

Is this spewing normal? There were no cooling issues prior to today, just the fan not having a low speed.

 

yes, put the cap back on and bleed it.

 

Do a search for the other elusive bleed screw way down near the center of the engine compartment just below the intake air box. Takes a long extension with, I believe, a 6 or 8mm socket.