STARTING AND OPERATING
337
Tirepressureschangebyapproximately1psi(7kPa)per
12°F(7°C)ofairtemperaturechange.Keepthisinmind
CAUTION!
After inspecting or adjusting the tire pressure, al-
waysreinstallthevalvestemcap(ifequipped).This
will prevent moisture and dirt from entering the
valvestem,whichcoulddamageit.
whencheckingtirepressureinsideagarage,especiallyin
thewinter.
Example: If garage temperature = 68°F (20°C) and the
outside temperature = 32°F (0°C) then the cold tire
inflationpressureshouldbeincreasedby3psi(21kPa),
which equals 1 psi (7 kPa) for every 12°F (7°C) for this
outsidetemperaturecondition.
Inflation pressures specified on the placard are always
coldtireinflationpressure.Coldtireinflationpressureis
definedasthetirepressureafterthevehiclehasnotbeen
drivenforatleastthreehours,ordrivenlessthan1mile
5
Tirepressuremayincreasefrom2to6psi(13to40kPa)
duringoperation.DONOTreducethisnormalpressure
build-up,oryourtirepressurewillbetoolow.
(1.6
km)afterathree-hourperiod.Thecoldtireinflation
pressure must not exceed the maximum inflation pres-
suremoldedintothetiresidewall.
Tire Pressures For High Speed Operation
Checktirepressuresmoreoftenifsubjecttoawiderange
of outdoor temperatures, as tire pressures vary with
temperaturechanges.
The manufacturer advocates driving at safe speeds
withinpostedspeedlimits.Wherespeedlimitsorcondi-
tions are such that the vehicle can be driven at high
speeds,maintainingcorrecttireinflationpressureisvery
important. Increased tire pressure and reduced vehicle
| Categories | Jeep Grand Cherokee Manuals, Jeep Manuals |
|---|---|
| Model Year | 2009 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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