Alecb
Well-Known Member
This saucer looking item connects to the heater core hoses. It has a few rust pinholes and is slowly leaking water. What is it? Is it necessary for my AC/heater?
Actually the function of those vacuum units is to close off hot water to the heater core when the AC is on MAX and when the heat/AC is off. In normal AC operation they allow hot water to flow to the heater core.It opens and closes hot water to the heater core, when AC is on closes hot water to heater core.
With optional rust includedThem two guys don't know jack. That's an early model vacuum operated experimental flux capacitor.
If it worked as you describe it would not be possible to affect (warm) the air out put when AC is selected. But one can affect the cold AC out put by using the Temperature Control lever. The Temperature Control lever blends in air that has passed through the heater core. Only on Max AC and when the system is Off is the water to the heater core blocked.There is a "control chart" in the AC section that shows water valve is closed in all AC positions regardless of whether AC or Max AC.