The air pump (also known as the secondary air injection pump) on a 2000 Pontiac Grand Prix GT is located on the
passenger side (right side) of the engine compartment, near the firewall. It's usually fairly close to the exhaust manifolds. However, the exact position might vary slightly depending on the engine (3.1L or 3.8L). You'll likely see a relatively large, cylindrical component with vacuum lines and possibly electrical connectors attached.
It's recommended to consult a repair manual specific to your vehicle's year and engine for a precise location diagram.
