Remove/Install Air Suspension Central Reservoir - AR32.22-P-2028MEX

Model 167.9 

with code 489 (AIRMATIC Dual Control/semi-active air suspension) 

except code 490 (Electrohydraulic suspension) 

Model 167.9 

with code 489 (AIRMATIC Dual Control/semi-active air suspension) 

with code 490 (Electrohydraulic suspension) 

Fig 1: Air Suspension Central Reservoir Components Location - Model 167.9 With Code 489 With/Without Code 490

Courtesy of MERCEDES-BENZ USA

Shown with code U79 (BlueTEC (SCR) diesel exhaust treatment Generation 3) 

Notice	Notes on self-locking nuts and bolts		AH00.00-P-0001-01KOA
Notice	Notes on air suspension		AH32.22-P-1000-01T
	Remove/install
1	Completely release the pneumatic pressure of the air suspension using the diagnostic system.	Build up the pneumatic pressure of the air suspension externally using the diagnostic system.	AR32.22-P-0013ME
2	Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).
3	Remove right rear fender liner.		AR88.10-P-1302ME
4	Remove cover (2).	Only install cover (2) after the leak test.
5	Detach pneumatic pressure line (3) at left and right from central reservoir (1) and seal openings using suitable stop plugs.	Do not stretch, crush or kink pneumatic pressure lines (3). This will result in damage to pneumatic pressure lines (3) and can impair their function. The thread on the connection of the respective pneumatic pressure lines (3) and the pneumatic pressure lines (3) themselves must not be damaged. Otherwise, leaks will occur.
		Pressure line of air suspension to central reservoir	*BA32.22-P-1009-03B
		Record plug	Fig 4
		Box wrench bit	Fig 3
		If a thread or a pneumatic pressure line (3) is damaged, ↓ repair connection of pneumatic pressure line (3) or repair pneumatic pressure line (3).	AR32.22-P-2001-01ME
		Pressure line of air suspension to central reservoir	*BA32.22-P-1009-03B
		Box wrench bit	Fig 3
		Knife	Fig 2
6	Remove screws/bolts (4).	Screw/nut, central reservoir to wheel well/body	*BA32.22-P-1010-03B
7	Release central reservoir (1) from underbody and move out to the right.
8	Install in the reverse order.
	Check
9	Check connections of pneumatic pressure lines (3) on central reservoir (1) for leak tightness.		AR32.22-P-8000ME

Fig 2: Identifying Knife (000 589 12 28 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Box Wrench Bit (001 589 00 03 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Record Plug (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA