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#28456 01/01/2005 8:39 PM | Joined: Mar 2001 Posts: 259 Member | | Member Joined: Mar 2001 Posts: 259 | The Valve regulates the amount of water that flows through the heater core. You can shut the water off in the summer to reduce the heat flow into the cab or manually adjust the amount of water that will flow through the heater core to get that just right temperature for the desired fan speed.
The valve isn't absolutely necessary to run a heater it is just a way to regulate the water flow through the heater core.
Joe
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