Remove/install coolant pump switchover valve - AR20.10-P-3000SXI

ENGINES 642 in MODEL 164, 212, 218, 251 with switchable coolant pump 

ENGINES 642.8 in MODEL 221 

Shown on engine 642.852 

Fig 1: Identifying Coolant Pump Switchover Valve Remove/Install Components - Shown On Engine 642.852

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove engine trim panel	Ensure correct seating of the engine cover.
		Model 164 Model 212, 218	AR01.10-P-2405GZB
		Model 221	AR01.10-P-2405SXI
		Model 251	AR01.10-P-2405RTB
2	Remove impact plate	Model 212, 221 The impact plate is installed in front of the belt drive.
3	Remove mixing chamber	Model 212, 218	AR09.20-P-1320OGE
		Model 221	AR09.20-P-1320SXI
		Model 164, 251	AR09.20-P-1320GZB
4	Disconnect electrical connector (5) on the coolant pump switchover valve (Y133)
5	Detach vacuum hoses (4)
6	Unclip coolant pump switchover valve (Y133) on mounting frame bow (3)
7	Remove coolant pump switchover valve (Y133) upwards
8	Install in the reverse order