380SL (107.045) V8-3.8L (116.960) (1982)
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Heater Control Valve: Description and Operation
Monovalve
Monovalve (11) Recirculating Pump (30)
The monovalve (11) controls the flow rate of the coolant in heat exchanger and comprises a magnetic valve, which is provided with plus (positive)
current directly from fuse element and is connected to ground in control range by electronic switching unit in a 5-second cycle. Without ground
connection the valve is always open, if ground is connected, the valve is completely closed. Opening and closing times are activated by the electronic
switching unit for temperature control and depend on the deviation from actual and desired temperature.
Monovalve (arrow for check valve)
The installed check valve (arrow) in lower housing section of monovalve makes sure that the heat exchanger is not filled with hot coolant when the
engine is stopped (monovalve "open").