Chevrolet 1999 Monte Carlo Owner's Manual page 256

3. Position the radiator air side baffle aside and remove
the two fasteners. Remove the snap screw from
the fascia.
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4. Slide the headlamp assembly inboard to release the
mounting tabs and gently pull the inside of the
assembly away from the vehicle.
5. Push the tab on the bulb socket and turn it
counterclockwise. Pull the socket out of the assembly.
6. Remove the bulb from the socket by pulling it out.
Do not twist the bulb.
7. Push in the new bulb.
8. Reverse Steps 1 through 4 to replace the assembly.
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