Here's a general approach, but proceed with caution and consult your owner's manual first. The manual will have diagrams and specific instructions for your car.
Steps (General - may not be exactly accurate for your Grand Prix):
1. Park the Car Properly: Park your Grand Prix on a level surface against a wall or garage door about 25 feet away. Make sure your car's tires are inflated to the correct pressure.
2. Locate the Adjustment Screws: Look for small screws or knobs usually located near the top and/or side of each headlight assembly (often behind a small access panel near the headlights or under the hood). These screws are typically labeled vertically (up/down) and horizontally (left/right).
3. Mark the Current Position (Optional but Recommended): Before you start adjusting, use a marker to lightly indicate the starting position of the screws. This helps if you make a mistake.
4. Adjust the Headlights: Usually, turning the vertical screw adjusts the beam's vertical aim (up or down), and the horizontal screw adjusts the horizontal aim (left or right). Turning the screw clockwise typically raises or moves the beam to the right, while counterclockwise lowers or moves it to the left.
5. Check the Aim: After each small adjustment, check the beam's position on the wall. You want the headlights to aim slightly downward and to the right to avoid blinding oncoming drivers, while still illuminating the road ahead adequately.
6. Repeat: Make small adjustments to the vertical and horizontal screws until the beams are properly aimed. The specific aim is usually indicated in your owner's manual, but generally, the low-beam cutoff should be slightly below the horizontal center line of the wall at 25 feet.
Important Considerations:
* Owner's Manual: Your 1998 Pontiac Grand Prix owner's manual is your best source of information. It will have precise diagrams and instructions tailored to your specific vehicle.
* Safety: Be careful not to overtighten the adjustment screws.
* Professional Help: If you're unsure about doing this yourself, it's best to take your car to a qualified mechanic or auto repair shop. They have the expertise and tools to adjust your headlights correctly.
* Bulb Condition: Ensure your headlight bulbs are correctly installed and not burned out or damaged as this will affect the aim even with proper adjustments.
Without your specific Grand Prix's model and trim information, it's impossible to give more precise instructions. Consult your owner's manual first.
