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I'm not sure about Yukons but Tahoes have some clips that also hold them down along with bolts
there are 2 clips on both sides of the grill along with 4 clips on the bottom of the grill...i used a flathead screwdriver to press the clips down and once you get them all unclipped, it slides right out.
Here you go, I don't have a Yukon but a Tahoe so I found a pic and circled some clips for you!
http://s285.photobucket.com/albums/ll55/nnaboyq156/?action=view¤t=Yuk.jpg
Here is a close up of the clip if you need it...press down on the middle of the clip and it should release