Where do you add coolant in your Mercedes 1994 s420?

To add coolant in a 1994 Mercedes S420, first ensure the engine is cool. Open the hood and locate the coolant reservoir, which is typically a translucent plastic tank near the engine. Remove the cap and add the appropriate coolant mixture (usually a 50/50 mix of antifreeze and water) until it reaches the "MAX" line. Be sure to securely replace the cap after filling.