Remove/install the air duct housing - AR09.20-P-0080QB

ENGINE 272.920 in MODELS 203.052/252/752 

ENGINE 272.940 in MODELS 203.054/254, 209.354/454 

ENGINE 272.960 in MODELS 203.056/256/756, 209.356/456 

ENGINE 272.970 in MODELS 203.087/287 

ENGINE 272.941 in MODELS 203.092/292 

ENGINE 273 in MODEL 209 

Fig 1: Identifying Air Duct Housing Components

Courtesy of MERCEDES-BENZ USA

	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
1	Turn key in ignition switch to position "0".
2	Open engine hood and raise to vertical position	Model 203	AR88.40-P-1000P
		Model 209
3	Remove air filter housing		AR09.10-P-1150QB
4	Remove hot film mass air flow sensor (B2/5)		AR07.07-P-1453QB
5	Detach the hose (1) at the centrifuge cover (2)
6	Detach retaining clamp (3) on the electric wiring harness from the air duct housing (4)
7	Push notch (4a) downwards and swing away air duct housing (4) from under throttle valve actuator (M16/6)
8	Raise notch (4b) and remove air duct housing (4) from throttle valve actuator (M16/6)
9	Detach the hose (1) at the air duct housing (4)	Only when replacing the air duct housing (4). Installation:  Replace the CLIC clamp (A). Never use screw and nut clamps or spring bracket clamps; otherwise, there is a possibility of leaks.
			*WH58.30-Z-1011-02A
10	Check seals (5) and replace if necessary
11	Install in the reverse order