The clutch reservoir on a 1999 Ford Mustang (assuming a manual transmission) is located
under the hood, typically near the master cylinder for the brakes. It's often a smaller reservoir than the brake master cylinder. It might be attached to the firewall or positioned nearby.
Because exact placement can vary slightly depending on specific trim level and any modifications, it's best to consult a repair manual specific to your 1999 Mustang or use online resources with pictures like a parts diagram or repair videos for a visual guide.
