Remove/install the air duct housing - AR09.20-P-0080GZA (ML350, ML550, GL450, GL550)

ENGINE 272, 273 in MODEL 164, 251 

Fig 1: Identifying Air Duct Housing Remove/Install 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 air filter housing		AR09.10-P-1150GZA
2	Remove hot film mass air flow sensor (B2/5)		AR07.07-P-1453GZA
3	Detach hose (1) at centrifuge cover (2)	Do not use pointed or sharp-edged tools to detach the hose (1); they will damage the hose.
4	Detach retaining clamp (3) on electric wiring harness from air duct housing (4)
5	Push notch (4a) downwards and swing away air duct housing (4) from under the throttle valve actuator (M16/6)
6	Raise notch (4b) and remove air duct housing (4) from throttle valve actuator (M16/6)
7	Detach hose (1) at air duct housing (4)	Only when replacing the air duct housing (4). Do not use pointed or sharp-edged tools to detach the hose (1); they will damage the hose. Installation:  Replace clamp (A). Never use screw and nut clamps or spring bracket clamps; otherwise, there is a possibility of leaks.
	Checking
8	Check seals (5)	Check seals (5) for wear and damage; replace if necessary.
9	Install in the reverse order