* Your Owner's Manual: The most reliable source. Check the manual's diagrams section. It should have a diagram showing the belt routing.
* Repair Manual: A Haynes or Chilton repair manual for your specific year and model will definitely contain a detailed diagram.
* Online Automotive Parts Websites: Websites like AutoZone, Advance Auto Parts, or Napa Auto Parts often have online parts lookups. When you select your vehicle's details, they *might* show a diagram of the serpentine belt routing. It's not guaranteed but worth a try.
* Google Images: Try searching "1989 Chevy Cavalier serpentine belt diagram AC". Be cautious, though, as not all images are accurate or for your exact model. Double-check against other sources.
* Local Auto Parts Store: A local auto parts store employee might have access to a diagram or a printed resource.
Important Note: Always double-check the diagram against your own engine bay before attempting to install a new belt. There can be slight variations based on specific engine options or regional differences.