2012 Jeep Grand Cherokee Owner Manual SRT - Page 457

STARTING AND OPERATING 455 CAUTION! After inspecting or adjusting the tire pressure, always reinstall the valve stem cap. This will prevent moisture and dirt from entering the valve stem, which could damage it. Tire pressures change by approximately 1 psi (7 kPa) per 12°F (7°C) of air temperature change. Keep this in mind when checking tire pressure inside a garage, especially in the winter. Example: If garage temperature = 68°F (20°C) and the outside temperature = 32°F (0°C) then the cold tire inflation pressure should be increased by 3 psi (21 kPa), Inflation pressures specified on the placard are always which equals 1 psi (7 kPa) for every 12°F (7°C) for this cold tire inflation pressure. Cold tire inflation pressure is outside temperature condition. defined as the tire pressure after the vehicle has not been driven for at least three hours, or driven less than 1 mile Tire pressure may increase from 2 to 6 psi (13 to 40 kPa) (1.6 km) after a three-hour period. The cold tire inflation during operation. DO NOT reduce this normal pressure pressure must not exceed the maximum inflation pres- build-up, or your tire pressure will be too low. sure molded into the tire sidewall. Check tire pressures more often if subject to a wide range of outdoor temperatures, as tire pressures vary with temperature changes. 5