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

Engine 176 In Model 167 

Engine 176 In Model 217, 222 

Engine 176 In Model 463 

as of model year 2019 

Engine 177 

Risk of injury  to skin ana 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

Example illustration 

Courtesy of MERCEDES-BENZ USA

Unlock 

1. Using a suitable tool, press in actuation ring (1) and keep pressed.
2. Pull out hose connection (2).
3. Relieve actuation ring (1).

   Lock 

4. Insert hose connection (2) into connector coupling and press in as far as it will go, applying a small amount of force.

   Locking takes place noiselessly and is not noticeable.

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