2009 Dodge Ram 1500 Pickup Owner Manual - Page 375

STARTING AND OPERATING 373 CAUTION! After inspecting or adjusting the tire pressure, always reinstall the valve stem cap (if equipped). This will prevent moisture and dirt from entering the valve stem, which could damage the valve stem. 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 outside temperature condition. is defined as the tire pressure after the vehicle has not been driven for at least three hours or driven less than Tire pressure may increase from 2 to 6 psi (13 to 40 kPa) 1 mile (1.6 km) after a three hour period. The cold tire during operation. Do not reduce this normal pressure inflation pressure must not exceed the maximum infla- build up or your tire pressure will be too low. tion pressure 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