1997 GMC Safari Owner's Manual - Page 300

Inflation -- Tire Pressure The Certificationrnire 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: (Continued) NOTICE: Don't let anyone tell you that underinflation or overinflation is all right. It's not. If your tires don't have enough (underinflation), you can air get the following: 0 Too much flexing 0 Too much heat 0 Tire overloading 0 Bad wear 0 Bad handling 0 Bad fuel economy. NOTICE: (Continued) If your tires have toomuch air (overinflation), you can get the following: 0 Unusualwear 0 Bad handling 0 Rough ride 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.lc&sby keeping out dirt and moisture. 6-44