Location of the light beam direction regulators on the headlight housing: 1 — light beam regulator in the horizontal plane; 2 - vertical beam regulator
If necessary, you can make an approximate adjustment to the direction of the light beams yourself.
The adjustment is carried out on a fully fueled and equipped car, with normal air pressure in the tires. Set the headlight beam adjuster handle to the "0" position (one driver or a driver with a passenger in the front seat) and turn on the low beam headlights.
By turning the regulator located closer to the vehicle axis, we change the position of the light beam in the horizontal plane.
Turning with a Phillips screwdriver…
...or using the 8 mm wrench, the regulator located further from the vehicle's axis, we change the position of the headlight beam in the vertical plane.
We adjust the direction of the light beam of the other headlight in the same way.
(The original source of the article is the website CHEVYMAN)