1957 part ID connected to heater return

[DIAS]

What is this? This is located at the top front of the engine. The water hose for the heater return is connected to this. When the engine is running, coolant comes out of it.

why?
Dirk A

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[Roadking 2]

It's the heater control valve. Coolant shouldn't be coming out of it. Where the coolant coming out?