To check the coolant level on the Mercedes Benz Class (W204), do the following:
- Carefully unplug the cork of 1 expansion item 2 on the floor-rotation to reset the pressure in the cooling system.
- Completely unplug the cork and take it off.
- To check the level of antifreeze-in cold condition, it must reach the control jumper 3 in the filler throat. In a hot state, the level must be approximately 1.5 cm above the reference jumper.
- If necessary, a distilled water tank or a recommended cooling liquid shall be filled in.