There are torx head nuts above the lights probably accessable through holes on the top of the grill area. Center torx nut controls up/down and the outside torx, above either headlight, controls side to side adjustment.
buy a new car.
I have changed the headlight but I need to adjust it as the lights don't hit the road
how do you adjust 2002 Denali headlights
how to adjust headlights on 1992 silverado
There are a couple of reasons why a 1999 Tahoe headlights may not work. A couple of reasons could be blown bulbs or the wiring.
Open the hood, and look between at the edge of the plastic piece that is the top of the grill, there above each headlight you will see two small stems, they are essentially custom bolts for adjusting the headlights.
How do you adjust headlights on a 2006 Hyundai Sonata v6
There are screws
headlights
how do I adjust headlights
adjust headlight
Where is the ecu fuse on a 2003 Tahoe