I need a diagram for a 1989 chevy p.u 3500 for a

Belt diagram is down at the bottom for Chevy trucks

https://www.google.com/search?q=serpentine+belt+on+my+1989+Chevy+Shasta+G30+rv

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there is a decal under the hood/engine compartment somewhere that the factory puts on that shows you the belt routing.

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c15280215ae3

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

This has already been answered .Any google will show many pictures all from this website.

go to autozone.com, enter your vehicle info and search for diagram.

hope this helps

Chevy made at least five different engines for pickups in 1989, and with a lot of accessory options. Check this link and select your pickup and engine size. When you get the listing of belts, if you see a small camera icon in the left column, click on it and you will see the diagram of the routing.

WikiAnswers says you should be able to obtain a diagram from your local parts store.

http://www.ehow.com/how_4506124_replace-serpentine-belt-chevy-silverado.html

454 with ac and a.i.r.

There should be a decal on the bottom side of your hood, or somewhere in the engine compartment. If there isn't just put it on the crankshaft (bottom pulley) and go ribs to ribs, and flats to flats, and work your way around.

This link will take you to a picture of the diagram. If the link doesn't work contact me and I can email you the picture directly.

http://autorepair.about.com/library/illustrations/bl506a-lib.htm