Do I need a new radiator cap, or can I reuse the old one?

Reuse your existing cap. This radiator works with OEM Esteem caps and pressurization systems. If your old cap leaks coolant or doesn't seal, replace it before install—a bad cap will cause overheating regardless of radiator condition.

Will I need to flush the cooling system or just swap the radiator?

Flush it. Old coolant sitting in the block and heater core can contain rust and mineral buildup that will clog a fresh radiator. A quick flush takes 30 minutes and prevents premature failure.

Are the mounting brackets and fan shroud hardware included?

Radiator assembly ships alone. Reuse your existing mounting brackets, rubber isolators, and shroud from the old unit. Test-fit before tightening anything permanently—make sure the new core sits flush at all four factory mounting points.