Remove/install air pump switchover valve - AR14.30-P-7255GZA (ML350, ML550, GL450, GL550)

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ENGINE 272, 273 in MODEL 164, 251

Fig 1: Identifying Air Pump Switchover Valve Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Remove/install
	Risk of injury caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, tailgates or sliding roof	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
1	Remove front engine cover (1)
2	Disconnect pneumatic lines (2) at air pump switchover valve (Y32)	Never use pointed or sharp tools to remove pneumatic lines (2), otherwise these may be damaged. Check pneumatic lines (2) for wear and damage; replace them if required.
3	Disconnect electrical connector (3) at air pump switchover valve (Y32)
4	Lift off locking tab (4) and pull off air pump switchover valve (Y32) from bracket (5)
5	Install in the reverse order
6	Connect STAR DIAGNOSIS and read fault memory	Stored faults which may be caused by disconnecting cables or by simulation during test operations, must be erased in the fault memory after completing the work.	AD00.00-P-2000-04A