Forget the aux water pump, just leave it bypassed, the mono valve is like a solinoid, if the rubber is ok and the valve moves when clicked on it's ok, default is full heat anyway so I doubt that's the problem. They do air lock very easy and are hard to burp, you might pull the upper hose off the rad. and fill with coolant, if that doesn't work you will have to find a way to force coolant through the the system to find the blockage.