Do I need to flush the AC system before installing this condenser?

Yes. When you replace a condenser, flushing removes debris and old oil from the system. Run flushing solvent through the lines and receiver-drier before bolting in the new unit, then refill with fresh refrigerant and PAG oil per your vehicle's spec.

Does this come with O-ring seals and fittings?

The condenser assembly arrives with factory fittings, but replacement O-rings and gaskets are sold separately. Pick up a seal kit matched to your model year — it's cheap insurance against leaks.

What tools do I need to swap this in?

Basic socket and wrench set, a jack and jack stands, and a refrigerant recovery machine (required by law — never vent refrigerant). Expect 1–2 hours if you're comfortable working in the engine bay. If AC work is new to you, have a shop handle the recovery and recharge.