Re: additional heating / valve/ 1937er Convertible Coupe

Posted by HH56 On 2023/3/27 14:45:44

In theory it should go in the supply line to shut off water going directly to the heater core. That way if the heater core sprung a leak it could be shut off and damage would be less likely to happen than if the supply was still present as it would be with the valve in the return line.

On most Packard inline engines from mid 30s on the water pump outlet goes into the block, water goes up thru the head where the heater port is located and then out the opening where the upper radiator hose connects to the radiator. That makes the head port the pressure side for the heater. The heater return goes back to the water pump and you will find that port is on the return side of the pump.