You might recall my struggles with installing the Rolling Steel Tent's serpentine belt. Twice. The main problem was not being able to see most of what I was doing. Well, today I saw an engine swap video. They pulled a 5.3 liter version of GM's V8 out of a project car. It's externally identical to the 4.8 liter engine in my van. And there, presto, was a great shot of all the pulleys and the routing of the serpentine belt. If only I'd seen this weeks ago. Things would've been a lot easier.
So for you owners of current-generation Chevy and GMC vans who want to replace your serpentine belt, here's that shot with my enhancements.
To replace the belt, tuck a loop between pulleys 1 and 3 and slip it over pulley 2. Then work the belt over 3, under 4, over 5 and under 6. Then pull on that wrench again to slip the belt over pulley 1, the tensioner.
Pulleys 1,2,4 and 5 have grooves that match the grooves on the inside of the belt. Pulleys 3 and 6 are smooth to match the outside of the belt. If you have grooves against smooth, or smooth against grooves, you have the belt routed the wrong way. If the belt is way too lose, you missed a pulley or routed it the wrong way.
You still need to do a lot of this by touch, and the belt will fight you. And you might need to get under the van to make sure the belt is properly aligned on pulley 2. But if I can do it without this diagram, you should be able to do it with the diagram. And with less swearing. Much less.