My 1941 Chevy 1 1/2 Ton (4408) has a round dimple at the very top of the radiator with an hose fitting (Hose is routed down to the bottom of the radiator on the driver side. Last time I drove it started pouring wawa at about a quart a minute when it reached 180 degrees. No over flow on the filler cap neck.
While I'm at it. what temp is the thermostat supposed to open at and what is the proper pressure cap for the radiator?
-=JD=-