I'm doing my first water cooled system test. Swiftech McRes -> Swiftech MCP650 -> heater core. There is lots of turbulence, and gurgle noise inside McRes, and air keeps getting spit out into the pump. No matter how much I try to get the air out, there is always a little left in there. Is this normal? Is there a fix for this, or is a T-line the remedy? 