FORD 2006 Freestar v.2 - Manual (Page 203)

How temperature affects your tire pressure
The Tire Pressure Monitoring System (TPMS) monitors tire pressure in
each pneumatic tire. The pressure in each tire is dependent upon several
factors, one of them being the contained air temperature (temperature of
the air inside the tire). As the contained air temperature increases, the tire
pressure also increases. While driving in a normal manner, a typical
passenger tire inflation pressure may increase approximately 2 to 4 psi (14
to 28 kPa) from a cold start situation. This increase in tire pressure is due
to an increase in the contained air temperature. Contained air temperature
is dependent upon several factors such as rate of tire rotation, tire
deflection, amount of braking, etc. In a similar manner, the tire pressure
will decrease if the contained air temperature decreases. For example, if
the vehicle is stationary over night with the outside temperature
significantly lower than the daytime temperature, the tire pressure may
decrease approximately 3 psi (20.7 kPa) for a drop of 30° F (16.6° C) in
ambient temperature. This lower pressure value may be detected by the
TPMS as being significantly lower than the cold pressure indicated on your
vehicles Safety Compliance Certification Label, and activate the TPMS
warning for low tire pressure. If the low tire pressure warning light is ON,
visually check each tire to verify that no tire is flat. If one or more tires are
flat, repair as necessary. Check air pressure in the road tires. If any tire is
underinflated, carefully drive the vehicle to the nearest location where air
can be added to the tires. Turn the ignition to the OFF position. Inflate all
the tires to the recommended inflation pressure.
The Tire Pressure Monitoring System is NOT a substitute for
manually checking tire pressure. The tire pressure should be
checked periodically (at least monthly) using an accurate tire gauge,
see Inflating your tires in this chapter. Failure to properly maintain
your tire pressure could increase the risk of tire failure, loss of control,
vehicle rollover and personal injury.
SNOW TIRES AND CHAINS
Snow tires must be the same size and grade as the tires you
currently have on your vehicle.
The tires on your vehicle have all weather treads to provide traction in
rain and snow. However, in some climates, you may need to use snow
tires and chains. If you need to use chains, it is recommended that steel
wheels (of the same size and specifications) be used as chains may chip
aluminum wheels.
2006 Freestar (win)
Owners Guide (post-2002-fmt)
USA (fus)
Tires, Wheels and Loading
203