2007 Volvo S60 Owner's Manual - Page 124

Use a tire gauge to check the tire inflation pressure, including the spare, at least once a month and before long trips. You are strongly urged to buy a reliable tire pressure gauge, as automatic service station gauges may be inaccurate. Use the recommended cold inflation pressure for optimum tire performance and wear. Under-inflation or over-inflation may cause uneven treadwear patterns. WARNING! Under-inflation is the most common cause of tire failure and may result in severe tire cracking, tread separation, or "blowout," with unexpected loss of vehicle control and increased risk of injury. Under-inflated tires reduce the load carrying capacity of your vehicle. When weather temperature changes occur, tire inflation pressures also change. A 10- degree temperature drop causes a corresponding drop of 1 psi (7 kPa) in inflation pressure. Check your tire pressures frequently and adjust them to the proper pressure, which can be found on the vehicle's tire information placard or certification label. Checking tire pressure A certain amount of air seepage from the tires occurs naturally and tire pressure fluctuates with seasonal changes in temperature. Always check tire pressure regularly. Cold tires Inflation pressure should be checked when the tires are cold. pg. 145 Wheels and tires General information The tires are considered to be cold when they have the same temperature as the surrounding (ambient) air. This temperature is normally reached after the vehicle has been parked for at least 3 hours. After driving a distance of approximately 1 mile (1.6 km), the tires are considered to be hot. If you have to drive farther than this distance to pump your tire(s), check and record the tire pressure first and add the appropriate air pressure when you get to the pump. If checking tire pressure when the tire is hot, never "bleed" or reduce air pressure. The tires are hot from driving and it is normal for pressures to increase above recommended cold pressures. A hot tire at or below recommended cold inflation pressure could be significantly under-inflated. To check inflation pressure: - Remove the cap from the valve on one tire, then firmly press the tire gauge onto the valve. - Add air to reach the recommended air pressure. - Replace the valve cap. - Repeat this procedure for each tire, including the spare. - Visually inspect the tires to make sure there are no nails or other objects embedded that could puncture the tire and cause an air leak. - Check the sidewalls to make sure there are no gouges, cuts, bulges or other irregularities. NOTE: If you overfill the tire, release air by pushing on the metal stem in the center of the valve. Then recheck the pressure with your tire gauge. Some spare tires require higher inflation pressure than the other tires. Consult the tire inflation tables on pages 146 and 147, or see the inflation pressure placard. pg. 146 Wheels and tires