I can't seem to find a serpentine belt diagram for a '91 GMC Sonoma 4.3 liter engine without AC.
My sincere apologies for the delayed response.
I am personally going back to answer your unanswered questions.
I have only been a free contributor to this site for the past 4-months.
I do not know if you still need this information, but I am going ahead and answering it anyway. You may want to Print the Diagrams for future use.
CLICK on the following LINK. It has the Belt Diagrams you will need.
If you would: Before Clicking: Let me know if this helped you, or if you have any additional information or questions. Feel Free to contact me at FixYa.com!
Again my apologies...
http://www.2carpros.com/car_repair_information/year/1991/make/gmc/model/sonoma/1991_gmc_sonoma_drive_belt_routing_diagram.htm
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serpentine belt diagram
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