M880 heater routing

Esteemed list members;

What is the correct routing for the water heater hoses?  Off the intake manifold, water pump, upper connection to heater and the lower connection are the 4 points, what goes where?

I think they were on the wrong way, if there is one, and it was REALLY hot in the cab even with everything off.  Thats why I ask.  And there the valve in one of the lines, if it matters where that goes too?

Thanks