Where is the windshield washer pump on a 1999 Grand Prix located?

The windshield washer pump on a 1999 Pontiac Grand Prix is located in the front of the vehicle, behind the bumper. More specifically, it's usually in the wheel well, either the passenger side or driver's side, often near the reservoir. You'll likely need to remove some splash shielding or parts of the bumper to access it. A repair manual specific to your 1999 Grand Prix will give you the most precise location and instructions.