Do I need new hoses or gaskets when I install this?

Reuse your existing hoses if they're in good condition. If they're cracked, brittle, or original to the vehicle, replace them now — far easier before the radiator goes in. Gaskets seal at the radiator tank; check them during install and swap if they're compressed or damaged.

Does this radiator come with a fan or thermostat?

Radiator assembly only — fan and thermostat are separate components. Your existing fan bolts to this radiator the same way it bolted to the original.

Will I need to flush the cooling system before installing this?

Yes. Drain old coolant completely, rinse the block and system with distilled water, then fill with fresh coolant rated for your vehicle. Old debris and sediment will restrict flow in a new radiator and defeat the whole swap.