17 11... Clean The Radiator Ribs

Necessary preliminary tasks: 

• Remove fan cowl  . See 17 11 035 REMOVING AND INSTALLING/REPLACING FAN COWL WITH ELECTRIC FAN (N52T) , 17 11 035 REMOVING AND INSTALLING/REPLACING FAN COWL WITH ELECTRIC FAN (N55) 17 11 035 REMOVING AND INSTALLING/RENEWING FAN COWL WITH ELECTRIC FAN (N63)  or 17 11 035 REMOVING AND INSTALLING/REPLACING THE FAN COWL WITH ELECTRIC FAN (N63 B40/B44 O 1) .

Release screws (1) on left and right from cover (3).

Tightening torque: 17 10 1AZ .

Release screws (2) behind sealing lip.

Tightening torque: 17 10 1AZ  . See RADIATOR, EXPANSION TANK (N63 B40/B44 O 0/1, N74) , RADIATOR, EXPANSION TANK (N52T) or RADIATOR, EXPANSION TANK (N55, N55 HYBRID, N57 D30 U/O/T/S 0/1) .

Lift out cover (3).

Fig 1: Cover And Screws Of Sealing Lip

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Check radiator (1) for dirt contamination.

Fig 2: Radiator

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To clean the radiator use a standard narrow vacuum-cleaner attachment (1) with a length of approx. 600 mm.

Fig 3: Vacuum-Cleaner Attachment

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Ensure that the cooler fins are not damaged.

Vacuum dirt off the radiator using a vacuum cleaner with a narrow attachment (1).

Fig 4: Vacuum Cleaner With Narrow Attachment

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Only if transmission oil cooler or power steering cooler fitted: 

Lift up transmission oil cooler/power steering cooler (1) slightly.

Vacuum dirt off the radiator using a vacuum cleaner with a narrow attachment (2).

Fig 5: Lifting Up Transmission Oil Cooler

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N63 B40/44 O 0/1 only: 

Only partially detach radiator cover (1) at top.

Using a vacuum cleaner with a narrow attachment (2), vacuum off the dirt between the air conditioning condenser and the radiator.

Fig 6: Vacuuming Between Radiator And Condenser

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Reassemble the vehicle.