2003 GMC Safari Owner's Manual - Page 281

Inflation - Tire Pressure The Certification/Tire label, which is on the rear edge of the driver's door, shows the correct inflation pressures for your tires when they're cold. "Cold'' means your vehicle has been sitting for at least three hours or driven no more than 1 mile (1.6 km). Notice: Don't let anyone tell you that underinflation or overinflation is all right. It's not. If your tires don't have enough air (underinflation), you can get the following: Too much flexing Too much heat Tireoverloading Bad wear Badhandling Bad fuel economy If your tires havetoo much air (overinflation), you can get the following: Unusual wear Badhandling Roughride Needless damage from road hazards When to Check Check your tires once a month or more. Don't forget your compact spare tire. It should be at 60 psi (420 kPa). How to Check Use a good quality pocket-type gage to check tire pressure. You can't tell if your tires are properly inflated simply by looking at them. Radial tires may look properly inflated even when they're underinflated. Be sure to put the valve caps back on the valve stems. They help prevent leaks by keeping out dirt and moisture. Tire Inspection and Rotation Tires should be rotated every 6,000 to 8,000 miles (10 000 to 13 000 km). Any time you notice unusual wear, rotate your tires as soon as possible and check wheel alignment. Also check for damaged tires or wheels. See When It Is Time for New Tires on page 5-66 and Wheel Replacement on page5-69 for more information. 5-64