How do you add coolant to 2004 clk 500?

To add coolant to a 2004 CLK 500, first ensure the engine is cool to prevent burns. Open the hood and locate the coolant reservoir, which is typically a translucent plastic tank near the radiator. Remove the cap and check the coolant level; if it's low, add a 50/50 mixture of engine coolant and distilled water until it reaches the "full" mark. Replace the cap securely and check for any leaks before closing the hood.