Volvo S40 Owner's Manual page 172

2007 Volvo S40
Inflation pressure should be checked when the tires are cold.
The tires are considered to be cold when they have the same temperature as the surrounding
(ambient) air.
157
07 Wheels and tires
Tire inflation
This temperature is normally reached after the car 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:
1. Remove the cap from the valve on one tire, then firmly press the tire gauge onto the valve.
2. Add air to reach the recommended air pressure
3. Replace the valve cap.
4. Repeat this procedure for each tire, including the spare.
5. 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.
6. Check the sidewalls to make sure there are no gouges, cuts, bulges or other irregularities.
NOTE
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