Heating system shutoff valve, component description - GF20.00-P-2200AMG
WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 2012 Mercedes-Benz GL550, 2012 Mercedes-Benz GL450, 2011 Mercedes-Benz ML63, 2011 Mercedes-Benz ML550, and 2011 Mercedes-Benz ML350. However, it is still accessible from the selected car via links, so may be relevant.
ENGINE 156.980 in MODEL 164, 251
ENGINE 156.982 in MODEL 209
ENGINE 156.983 in MODEL 211, 219
ENGINE 156.984 in MODEL 216, 221
Location
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 Ω 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).