How do you check coolant level on a 2003 Cadillac CTS?

To check the coolant level on a 2003 Cadillac CTS, first ensure the engine is cool to avoid burns. Open the hood and locate the coolant reservoir, which is typically a translucent plastic tank. Check the fluid level against the marked indicators on the side of the reservoir; it should be between the "MIN" and "MAX" lines. If the coolant is low, add the appropriate coolant mixture as specified in the owner's manual.