[elmariachi]

Once you get all the air out, you should be able to maintain a consistent coolant level in the tank. If you look on my thread I posted a video of my tank gurgling like a volcano, at idle spitting out hot coolant. This is what happened immediately after I installed a hi-flow t-stat. So I went back to a $6 NAPA OEM stat with 4 hols drilled. I also had to bump up to a 16 lb. radiator cap to stop the boil-overs at idle. Of course, once I solve the hot idle issue (hopefully with this new fan) I would bet I can go back to a stock 14 lb pressure cap.

You can install a recovery system, but it needs to be closed, with the right cap capable of allowing fluid to move in and out of the coolant recovery tank. But you need to figure out if the coolant loss is all attributed to boiling over, or if you are losing it somewhere else.

I'd want to stop the boilover first (and the source of the high temps causing it) before addressing a recovery tank.