1. Open the hood or bonnet of your C-Class.
2. Once the hood is lifted, the radiator should be directly located behind the front grille area and in front of the engine block.
3. The radiator is typically secured onto the radiator support frame through brackets and rubber mountings.
The radiator may look like a black grid placed vertically at the front end of the vehicle. Note that it is behind the Mercedes emblem star found on the grille; sometimes the bottom half of the emblem needs to be released or removed to access the radiator. Additionally, a plastic engine cover might provide extra protection for the engine and will need to be removed to have direct access to the radiator. It may be best to consult your owner's manual or a detailed guide to ensure the accurate removal of any panels or covers needed to properly access the radiator.