Ok, so basically I had it backwards the first time? How about this.

1 . Hot coolant out the hose at the top of the head and into the heater core.

2. Through and out the heater core, through the monovalve and through the hose to the aux heater assembly.

3. Through the aux heater assembly and to the hose leading back into the engine by the alternator.

4. Into the engine and to the water pump where it all starts the circuit again

Correct??

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)