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Home >> Mercedes Benz >> 2019 >> CLS450 Base >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Engine Cooling System - 257 Chassis >> Testing & Repair >> Remove/Install Coolant Expansion Reservoir - AR20.30-P-4949MSA

Remove/Install Coolant Expansion Reservoir - AR20.30-P-4949MSA

Engine 256 in model 213, 238, 257, 290 

Fig 1: Coolant Expansion Reservoir Component Location - Engine 256 In Model 257
G14548340Courtesy of MERCEDES-BENZ USA
WARNING Risk of injury  to skin and eyes suffering scalding from contact with hot coolantspray.
Risk of poisoning  from swallowing coolant.
Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the overpressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.
AS20.00-Z-0001-01A 
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
Notice Notes on coolant   AH20.00-P-2080-01KOA 
REMOVINGINSTALLING Remove/install     
1 Remove heat shield (3)    
2 Remove the cap (2)    
3 Suction off coolant from coolant expansion reservoir (1) and collect coolant in suitable container SPECIAL TOOL Hand pump Fig 2
4 Remove the vent line (4) from the coolant expansion reservoir (1) and seal openings with suitable stop plugs   AR20.20-P-7441-01RQ 
    SPECIAL TOOL Record plug Fig 4
5 Unclip the coolant expansion reservoir (1)    
6 Remove the coolant hose (5) from the coolant expansion reservoir (1) and seal openings using suitable protective covers   AR20.20-P-7441-01RQ 
    SPECIAL TOOL Set of protective caps Fig 3
7 Release and disconnect electrical connection (6)    
8 Remove the coolant expansion reservoir (1)    
9 Check the rubber guides of the coolant expansion reservoir (1) for damage In case of a complaint

Replace rubber guides.
 
10 Install in the reverse order    
11 Check engine cooling system for leaktightness   AR20.00-P-1010MSA 
Fig 2: Identifying Hand Pump (210 589 00 71 00)
G07742725Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Set Of Protective Caps (001 589 00 91 00)
G12079434Courtesy of MERCEDES-BENZ USA
Fig 4: Identifying Record Plug (129 589 00 91 00)
G09975019Courtesy of MERCEDES-BENZ USA