This comprehensive manual provides detailed information about the 1999 GMC Sonoma. It covers a wide range of topics including the vehicle's introduction, instrument cluster, entertainment systems, climate controls, lights, driver controls, locks and security, seating and safety restraints, driving, customer assistance, reporting safety defects (U.S. only), cleaning, maintenance and specifications, engine compartment, engine oil, battery, fuel information, air filters, part numbers, refill capacities, lubricant specifications, and accessories. This manual is an essential resource for any 1999 GMC Sonoma owner, providing valuable insights and guidance on operating and maintaining their vehicle.