06 Yukon XL. Past time to change the antifreeze. Haynes showed picture of radiator drain. Said pull the rubber drain hose down. No drain hose. OK. Next step. Said turn the little knob. No knob. What the heck. Why is there no knob??? Probably cost to much. Haynes showed a picture of the block drain plugs. Said to drain the block. Right, one was above the starter. I might have been able to get to it if I pulled the wheel. The other was above the transfer case. Probably same deal. I was worried about getting them back in. I said forget that plan, go to plan 'B'. Pulled the bottom hose and then the top. I was really surprised at how easy the hoses came off. Got about 2 1/2 gallons out and back in.