Ambient Temperature Change And Tire Pressure - Ford Expedition Modifiers Manual

1-12 General Information
Section 1: General Information
The TPMS, as delivered from the Ford Motor Company, complies with part 15 of the FCC rules
and with RS-210 of Industry Canada. Operation is subject to the following 2 conditions:
• This device may not cause harmful interference
• This device must accept any interference received, including interference that may cause
undesired operation.

Ambient Temperature Change and Tire Pressure

NOTICE: Do not inflate tire higher than maximum pressure stamped on tire sidewall.
Premature tire wear or damage to the tire may result.
Tire pressures fluctuate with temperature changes. For this reason, tire pressure must be set to
specification when tires are at outdoor ambient temperatures. If the vehicle is allowed to warm up
to shop temperatures, and the outside temperature is less than shop temperature, the tire inflation
pressure must be adjusted accordingly.
If the tires are inflated to specification at shop temperatures, and the vehicle is moved outdoors
when the outdoor ambient temperature is significantly lower, the tire pressure may drop enough to
be detected by the tire pressure monitoring system (TPMS) and activate the TPMS warning lamp.
2010 Expedition SSV Modifiers Guide, 07/2009