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Home >> Mercedes Benz >> 2021 >> GLS450 >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System - 167 Chassis >> Testing & Repair >> Remove/Install Fan Unit >> Remove/Install Fan Unit - AR20.40-P-5050MSC
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Remove/Install Fan Unit - AR20.40-P-5050MSC

Engine 256.9 in model 167 

MODIFICATION NOTES

24.07.2019 Special tool added. Operation step 3  
G14790408Courtesy of MERCEDES-BENZ USA
CAUTION Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.
AS00.00-Z-0017-01A
Topical note  Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
REMOVINGINSTALLING Remove/install     
1 Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).    
2 Remove upper engine cover.   AR01.10-P-2405MSC
3 Remove engine air intake duct upstream of air filter. SPECIAL TOOL Dismantling tool Fig 1
4 Unclip automatic transmission oil cooler from fan unit (1). Engine 256.9 in model 167 with transmission 725.0 AR27.55-P-1000MSC
5 Unclip coolant line (3) from fan unit (1). IMPORTANT Number of coolant lines varies depending on the vehicle equipment.  
6 Unclip bracket (2) from fan unit (1).    
7 Release and disconnect electrical connector from fan unit (1).    
8 Unclip fan unit (1) from cooler mounts and remove upward.    
9 Install in the reverse order.    
Fig 1: Identifying Dismantling Tool (000 589 95 63 00)
G13659648Courtesy of MERCEDES-BENZ USA