[Drbrown]

Although a '47, coolant in my heater system flows like the others describe here .... from outlet on passenger side head, thru heater core, then thru the control valve into the water pump on the passenger side. My control valve body has a directional flow arrow on it with the word "Shut" at one extreme. When I flush the engine's cooling system, I disconnect the hoses from the heater core and spray water from my garden hose thru the core to flush it out.