1997 GMC Suburban Owner's Manual - Page 400

At Least Twice a Year Restraint System Check Make sure the safety belt reminder light and all your belts, buckles, latch plates, retractors and anchorages are working properly. Look for any other loose or damaged safety belt system parts. If you see anything that might keep a safety belt system from doing its job, have it repaired. Have any torn or frayed safety belts replaced. Also look for any opened or broken air bag coverings, and have them repaired or replaced. (The air bag system does not need regular maintenance.) your oil is changed. See "Air Cleaner" in the Index for more information. Inspect your air cleaner filter restriction indicator more often if the vehicle is used in dusty areas or under off road conditions. Automatic Transmission Check Check the transmission fluid level; add if needed. See "Automatic Transmission" in the Index. A fluid loss may indicate aproblem. Check the system and repair if needed. At Least Once aYear Key Lock CylindersService Lubricate the key lock cylinders with the lubricant specified in Part D. Wiper Blade Check Inspect wiper blades for wear or cracking. Replace blade inserts that appear worn or damaged or that streak or miss areas of the windshield. Also see "Wiper Blades, Cleaning" in the Index. Body Lubrication Service Lubricate all fuel door, body hood and body door hinges, rear compartment hinges, tailgate handle pivot points, latches, locks and folding seat hardware. Part D tells you what to use. More frequent lubrication may be required when exposed to a corrosiveenvironment. Air Cleaner Filter Restriction Indicator Check Your vehicle has an indicator on the engine that lets you know when the air cleaner filter is dirty and needs to be changed. Check indicator at least twice a year or when 7-44