This diagram shows a graphical layout of the heating system I built for my MaXum. The hot coolant pump takes coolant from the intake manifold, and pumps it into the system. The return goes into the engines water pump inlet.

You can download the image, and blow it up to read the text.
 

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This schematic shows the electrical layout of the heater system. 
R/PU is system power supply. 
The ground circuits are shown as trees for simplicity. 
The water pump switches ground the circuit to the coolant pump. The power supply to the switches is for illumination.
When either switch is on, both light up, so pump operation can be determined from either switch location.
The heater blower motors are 2 speed.

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