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Take a look for a belt diagram under the hood. Usually a print on the AC mounting bracket and that may be covered with dirt. If you can't locate one, get back to me and let me know how many air pumps you have...........one or two. I should be able to come up with something.
I am attaching a link to one that I think is yours. Print out a copy so you have it. Hope this proves helpful here. Please get back to me if you need more later as all follow ups are included in our fee. https://www.bing.com/images/search?q=chevy+motorhome+belt+routing+diagram&view=detailv2&&id=5D3978B3C5372E0C3964977FEC750CF05AAAB329&selectedIndex=0&ccid=vGgxabSM&simid=608046028709364629&thid=OIP.Mbc683169b48c4960d600d679f7ce20c2o0&ajaxhist=0
IF yours are slightly different................they should at least be the same pulleys involved.
Did you get the belts based on the OEM part numbers or off the old belts?
Did you look at the drawing on the left?
The belt that is closest to the engine has to go on first. And it should be one of those diagrams as those were also earlier engines that used that.
I know it can be hard to do.........you might want to call in a mobile tech that has personal knowledge about changing these out. I will opt out of this and allow another tech to offer something if they can.
hi . are you still requiring assistance ?
do you know if the air conditioning system on your M/H is factory GM or an add on aftermarket system ?
okay . Let me know . :-)