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Home >> Mercedes Benz >> 2025 >> GLA250 Base >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine - Cooling System -- 247 Chassis >> Testing & Repair >> Remove/Install Coolant Expansion Reservoir >> Remove/Install Coolant Expansion Reservoir - AR20.30-P-4949MFD

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

Engine 260, 282 in model 118, 177, 247 

G16048777Courtesy of MERCEDES-BENZ USA

Shown on model 177 with engine 282 

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 
WARNING Risk of injury  . Skin or eye injuries may result when handling hot or glowing objects. Wear protective gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
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 avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
Notice  Notes on coolant   AH20.00-P-2080-01KOA 
Notice  Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
REMOVINGINSTALLING Remove/install     
1 Slowly unscrew the cap for the coolant expansion reservoir (1) and reduce the overpressure.    
2 Suction off the coolant from the coolant expansion reservoir (1) and collect it in a suitable container. SPECIAL TOOL Hand pump Fig 2
3 Release and disconnect the electrical connection (2) on the coolant expansion reservoir (1) and detach the electrical wiring harness on the coolant expansion reservoir (1). SPECIAL TOOL Dismantling tool Fig 1
4 Release and disconnect the coolant lines (3) and seal using suitable protective covers/stop plugs. SPECIAL TOOL Set of protective covers Fig 3
    SPECIAL TOOL Record plug Fig 4
5 Detach and remove the coolant expansion reservoir (1) at the catch tabs (4).    
6 Install in the reverse order.    
INSPECT Check     
7 Check and, if necessary, correct the coolant level.   AR20.00-P-1142MFC 
Fig 1: Identifying Dismantling Tool (000 589 95 63 00)
G12619044Courtesy of MERCEDES-BENZ USA
Fig 2: Identifying Hand Pump (210 589 00 71 00)
G07742725Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Set Of Protective Covers (001 589 11 91 00)
G14785720Courtesy of MERCEDES-BENZ USA
Fig 4: Identifying Record Plug (129 589 00 91 00)
G09975019Courtesy of MERCEDES-BENZ USA