Opening the bonnet on older Mercedes models, including the C220, requires steps that are difficult to figure out if you don't have the owner's manual. The C-class is the smallest Mercedes sedan in the United States. The E-Class and S-class are the two larger sedan models. The C220 has a four cylinder engine and was sold from 1993 to 1996, when it was replaced by the C230 sedan.
Pull the bonnet release located in front of the emergency break near the driver's side door. Pull the lever toward you. You will hear the bonnet unlock when the bonnet is released.
Walk to the front of bonnet and look for a tab sticking out from the grill. It is about 2 inches long and grey in colour.
Pull the bonnet release pull tab and hold it while lifting up on the bonnet.