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Home >> Mercedes Benz >> 2021 >> G63 AMG >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System - 463 Chassis >> Testing & Repair >> Unlock/Lock Coolant Expansion Reservoir Connector Coupling - AR20.30-P-0010-02XGA

Unlock/Lock Coolant Expansion Reservoir Connector Coupling - AR20.30-P-0010-02XGA

Engine 176 in model 463 as of model year 2019 

Engine 176 in model 167 

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 pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.
AS20.00-Z-0001-01A 

Example illustration 

G13656832Courtesy of MERCEDES-BENZ USA

Unlock 

  1. Use a suitable tool to press in the actuating ring (1) and keep it pressed.
  2. Pull out the hose connection (2).
  3. Release the actuation ring (1).

    Lock 

  4. Insert the hose connection (2) into the plug-in coupling and push it in up to the stop with little effort.

    IMPORTANT The locking is noiseless and is not noticeable.

  5. Check for correct locking by gently pulling on the hose connection (2)