2003 GMC Sierra 1500 Pickup Owner's Manual - Page 511

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.) Engine Air Cleaner Filter Restriction Indicator Check (If Equipped) Your vehicle has an indicator located on the air cleaner in the engine compartment 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 your engine oil is changed, whichever occurs first. See Engine Air Cleaner/Filter on page 5-23 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. Weatherstrip Lubrication Silicone grease on weatherstrips will make them last longer, seal better, and not stick or squeak. Apply silicone grease with a clean cloth. During very cold, damp weather more frequent application may be required. See Part D: Recommended Fluids and Lubricants on page 6-18. Wiper Blade Check Inspect wiper blades for wear or cracking. Replace blade inserts that appear worn or damagedor that streak or miss areas of the windshield. Also see Cleaning the Outside of Your Vehicle on page 5- 105. Spare Tire Check At least twice a year, after the monthly inflation check of the spare tire determines that the spare is inflated to the correct tire inflation pressure, make sure that the spare tire is stored securely. Push, pull, and then try to rotate or turn the tire. If it moves, use the wheel wrenchhatchet to tighten the cable. See Changing a Flat Tire on page 5-84. 6-12 Manual Transmission Check Check the transmission fluid level; add if needed. See Manual Transmission Fluid on page 5-31. Check for leaks. A fluid leak is the only reason for fluid loss. Have the system inspected and repaired if needed.