Heater Control Valve: Description and Operation

GF20.00-P-2200AMG Heating System Shutoff Valve, Component Description
ENGINE 156.980 in MODEL 164, 251 up to Model Year 8
ENGINE 156.982 in MODEL 209
ENGINE 156.983 in MODEL 211, 219
ENGINE 156.984 in MODEL 216, 221 up to Model Year 8





Location
Y16/2 Heating system shutoff valve

The shutoff valve is located at the rear on the right cylinder head.

Task
To warm up the engine quickly following a cold start, the shutoff valve can close off the coolant circuit to the heating system.

Design
The shutoff valve consists of a solenoid with a coil resistance of around 12 ohms at 25 °C.

Function
The heating system shutoff valve is actuated by the ME-SFI control unit (N3/10) via a ground signal if required. The shutoff valve is opened without a current.
If the vehicle heater is switched on, the shutoff valve is always open (not actuated).