Auxiliary Water Pump: Description and Operation

GF20.10-P-3200AMG Component Description For The Engine Coolant Circulation Pump
ENGINE 156.980 in MODEL 164, 251 up to Model Year 8
ENGINE 156.984 in MODEL 216, 221 up to Model Year 8





Location for model 164

M45 Engine coolant circulation pump

The engine coolant circulation pump is located on the right next to the engine radiator.

Location on model 251
The engine coolant circulation pump is located on the outer right behind the bumper.





Location on model 216, 221
18 Engine oil heat exchanger
M33 Electric air pump
M45 Engine coolant circulation pump

The engine coolant circulation pump is located on the lower right next to the engine radiator.

Task
The engine coolant circulation pump ensures circulation of coolant through the engine oil heat exchanger.





Actuation for model 164, 251 (shown is the engine compartment at the right)

F58 Engine compartment fuse and relay box
F58f102 Fuse 102 (circulation pump fuse for coolant for engine oil heat exchanger)
F58kC Coolant circulation pump relay (engine oil heat exchanger)
F58kD Engine circuit 87 relay
F58kE Air pump relay
F58kI Starter relay

The engine coolant circulation pump is actuated for an excessively high engine oil temperature by the ME-SFI [ME] control unit (N3/10) via the coolant circulation pump relay.





Actuation for model 216, 221 (shown is the engine compartment at the front middle)
N10/2 Rear SAM control unit with fuse and relay module
N10/2f116 Fuse 116 (engine coolant circulation pump for engine oil heat exchanger)
N10/2kQ Circulation pump relay (engine coolant for engine oil heat exchanger)

The engine coolant circulation pump is actuated for an excessively high engine oil temperature by the ME-SFI [ME] control unit (N3/10) via the circulation pump relay.