Remove/Install Fan Unit - AR20.40-P-5050GQ

Engine 276, 642 in model 292 

Engine 276, 642, 651 in model 166 

Fig 1: Fan Unit Components Location - Engine 276, 642 In Model 166

Courtesy of MERCEDES-BENZ USA

Shown on model 166 with engine 276.9 

Courtesy of MERCEDES-BENZ USA

Shown on model 166 

	Remove/install
1	Remove upper engine cover
2	Remove the engine air intake ducts (2) upstream of the air filter housing	Engine 276.8 in model 166, 292	AR09.10-P-1150GQC
		Engine 642 in model 166, 292	AR09.10-P-1150OGR
		Engine 651 in model 166	AR09.10-P-1150CD
3	Disconnect electrical connection (5) on fan unit (4) and unclip electrical line on fan unit (4)
4	Unlock and detach vent line on coolant expansion reservoir and on cooler	Engine 642 in model 292 Engine 642, 651 in model 166
5	Unclip vent line from fan unit (4) and from bracket for glow output stage and lay outside the working area	Engine 642 in model 292 Engine 642, 651 in model 166
6	Press unlocking lugs on cooler aside and remove fan unit (4) upwards	Ensure correct seating of the guides (A) on radiator frame.
7	Install in the reverse order