Do I need to drain coolant before swapping this in?

Yes. Disconnect and drain the cooling system before removing the old radiator. Flush the system to remove debris, then refill with fresh coolant after installation. Refer to your vehicle's service manual for the correct coolant type and capacity.

Will this work as a replacement if mine is leaking?

This is an OEM auxiliary radiator, so it's engineered as a direct replacement for the factory unit. If your existing radiator is damaged or leaking, this assembly restores factory cooling performance without modification to the truck.

What about hoses and clamps—are those included?

Only the radiator assembly is included. You'll need to reuse your existing hoses and clamps if they're in good condition, or source replacements separately if yours are cracked or worn. Check fitment during install.