2003 Chevrolet Monte Carlo Owner's Manual - Page 295

Inflation -- Tire Pressure The Tire-Loading Information label, which is on the inside of the trunk lid, 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). 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. Nofice: 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 muchflexing Too muchheat Tire overloading Bad wear Bad handling Bad fueleconomy Tire Pressure Monitor System Your vehicle may have the tire pressure monitor system that can alert you to a large change in the pressure o one tire. The system "learns" the pressure for each f tire throughout the operating speed range of your vehicle. The system normally takes between 45 and 90 minutes of driving to learn the tire pressures. This time may be longer depending on your individual driving habits. Learning need not be accumulated during a single trip. Once learned, the system will remember the tire pressures until the system is recalibrated. If your tires have too much air (overinflation), you can get the following: * Unusual wear Bad handling Rough ride Needless damage from road hazards 5-60