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Home >> Mercedes Benz >> 2018 >> S450 Base >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Cooling Systems >> Engine Cooling System - 222 Chassis (1 Of 2) >> Testing & Repair >> Remove/Install Coolant Expansion Reservoir >> Remove/Install Coolant Expansion Reservoir - AR20.30-P-4950LF

Remove/Install Coolant Expansion Reservoir - AR20.30-P-4950LF

Model 217 with engine 157, 276, 278, 279 

Model 222 with engine 157, 256, 276.8/9, 277, 278, 279, 642, 651 

Shown on vehicle with engine 278 

Fig 1: Coolant Expansion Reservoir Components Location - Model 222 With Engine 276.8 (Shown With Engine 278)
G15362607Courtesy of MERCEDES-BENZ USA

Shown on vehicle with Engine 651 

G15362608Courtesy 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 
Notice  Notes on coolant   AH20.00-P-2080-01KOA 
  Notes on coolant level   AH20.00-P-1142-01CW 
REMOVINGINSTALLING Remove/install     
1 Open hood    
2 Remove cover over coolant expansion reservoir (2)    
3 Unscrew cap (1) of coolant expansion, reservoir (2)    
4 Suction off coolant from coolant expansion reservoir (2) SPECIAL TOOL Hand pump Fig 2
5 Disconnect electrical connection (5)    
6 Detach coolant hoses (9) from coolant expansion reservoir (2)    
7 Lift lock (3) and pull coolant lines (4) out of coolant expansion reservoir (2) INSTALLATION IMPORTANT Replace O-rings at coolant lines (4).  
8 Remove screw (6) and lift coolant expansion reservoir (2)    
9 Remove coolant hose (7) at coolant expansion reservoir (2)   AR20.20-P-7441-01RQ 
10 Remove coolant expansion reservoir (2) in upward direction INSTALLATION IMPORTANT Make sure rubber bushings (8) are seated properly.  
11 Install in the reverse order    
INSPECT Check     
12 Check engine cooling system for leaktightness   AR20.00-P-1010LF 
Fig 2: Identifying Hand Pump (210 589 00 71 00)
G13657408Courtesy of MERCEDES-BENZ USA