I have 2008 yukon. i have replaced 7 headlamps

My automotive database says you have to remove headlamp assembly to replace bulb. To remove headlamp assembly, you need to remove front bumper fascia.
Why in the world should you have to remove front of vehicle just to change a bulb, I don't know? My database is the only info I have to go by. I doubt I can walk you through it, step by step, I can't see anything from here.

some times headlamp units have a plastic retaining clip on the underside of headlamp, does the headlight move from side to side? try to pull the headlight back from the top of unit then lift up the headlamp unit, if not it could be the headlamp adjusters holding unit in place.

Open hood reach behind headlight and remove bulb. If you can't reach bulb look at top of headlight ans look for screws or bolts. Remove them and pull headlight out and remove bulb. Replace bulb not touching glass if you do wipe with alcohol. Replace headlamp. If this helps please rate it. Thanks

Lift the hood and remove the bulb from the inside rear of the headlamp. The bulb assembly has ears on it that you use to unscrew the bulb. Look at the autozone link below to see the bulb. Installation is reverse of removal. Note: DO NOT TOUCH THE NEW BULB GLASS WITH YOUR FINGERS!! They are halogen bulbs and will burnout.



http://www.autozone.com/autozone/parts/Silver-Star-Headlight/2008-GMC-Yukon-2WD/_/N-js79yZ9ci8c?counter=0&itemIdentifier=862293_0_7179_

1. Loosen only, do not remove, the lower outside hidden headlamp bolt (2). 2. Depress the housing support tab with a flat-bladed tool downward in order to release the headlamp assembly from the support. 3. Pull the lamp assembly slightly forward to access the electrical connection. 4. Disconnect the forward lamp harness main electrical connector from the headlamp harness.
Headlamp Screws (Qty: 2)
1 Caution: Refer to Fastener Caution .
6 Nm (53 lb in)
O Headlamp Screw (Hidden)
6 Nm (53 lb in)
3 Headlamp Housing Support


Preliminary Procedure Remove Healamp
Remove either the LF or RF headlamp assembly. Refer to Headlamp Replacement (Chevrolet) Headlamp Replacement (GMC HD)
Headlamp Replacement (HD Diesel).
Headlamp Bulb (Hi)
Warning: Refer to Haiogen Bulb Warning .
Tip: Rotate the bulb socket a quarter turn counterclockwise and remove the bulb from the headlamp.
Headlamp Bulb (Lo)
Tip: Rotate the bulb socket a quarter turn counterclockwise and remove the bulb from the headlamp.

Need more come to https://www.autorepairhelp.us

I will assume you are talking about the headlight?!

Removal
CAUTION: do not touch the glass of halogen bulbs with fingers or other possibly oily surface, reduced life will result.

1) Disconnect and isolate negative battery cable.
2) Remove headlamp unit retaining screws. (bolts)
3) Remove headlamp unit to expose back of unit.
4) Disconnect wire connector from back of headlamp bulb.
5) Rotate retaining ring counterclockwise.
6) Remove retaining ring.
7) Pull headlamp bulb and remove from headlamp unit.

Installation

1) Install headlamp bulb to the headlamp unit.
2) Install headlamp bulb retaining ring.
3) Rotate retaining ring clockwise.
4) Connect wire connector to bulb.
5) Install headlamp unit.
6) Install headlamp retaining screws. (bolts)
7) Connect the battery negative cable.

More detailed info on how to get unit out.

Removal

1) Disconnect and isolate the battery negative cable.
2) Remove the two retaining screws.
3) Remove the upper fascia retainers by prying under the head of the fasteners with a flat bladed tool.
4) Remove headlamp unit from fender side first, then pull headlamp unit out.
5) Disconnect the wiring harness from the bulbs.
6) Remove the headlamp unit.

Installation

1) Connect wire harness to the bulbs.
2) Install headlamp unit.
3) Install the retaining screws.
4) Install upper fascia retainers.
5) Connect the battery negative cable.

I hope this will help you to get the light changed.

I'll assume you want to change the bulbs, not the headlamps themselves. I've listed the steps below to change the bulbs. Both sides use the same procedure
STEPS TO REPLACE HEADLIGHT BULB
1. Remove the dust cover from behind the bulb that needs replacement.
2. Unplug the bulb.
3. Taking note of the bulb orientation, unhook the bulb retaining clip from the tang that holds it in place.
4. Remove the bulb.
5. Install the new bulb in the same orientation and clip in place.
6. Reconnect the electrical connector to the bulb.
7. Reinstall the dust cover.

Alternatively, if the bulb is burned out and you have less than 60,000 miles, you should take the car to the dealer and let them do it for free for you.

It should be pretty easy, thats why there no "directions" Lift up the hood, now at the headlights there should be 2 rods, lift these rods and the lights should lift out, to access the bulbs.

Open the hood, above each headlight is 2 rods, unlatch the rods and lift striaght up, the headlight will now lift out and you can replace the bulb, It turns about 1/3 of a turn left to unlatch the bulb. After the bulb is replaced, set headlight back in place and push the rods back down, you may need to wiggle the light housing to align the holes so the rods seat all the way down.

they are replaced from inside the engine compartment.... look inside at the back of where the headlights are. you may have to remove the battery to change the one on that side. if it has dual batteries ... you will probably have to remove them both.

Robert