2008 JEEP GRAND CHEROKEE Owners Manual

WARNING!
Raising the vehicle higher than necessary can make
the vehicle less stable. It could slip off the jack and
hurt someone near it. Raise the vehicle only enough
to remove the tire.
6. Remove the lug nuts and wheel.
7. Position the spare wheel/tire on the vehicle and install
the lug nuts with the cone-shaped end toward the wheel.
Lightly tighten the nuts. To avoid the risk of forcing the
vehicle off the jack, do not tighten the nuts fully until the
vehicle has been lowered.
8. Lower the vehicle by turning the jack screw counter
clockwise, and remove the jack and wheel blocks.
9.
Finish tightening the lug nuts. Push down on the
wrench while tightening for increased leverage. Alternatenuts until each nut has been tightened twice. Correct wheel
nut tightness is 130 N´m (95 ft. lbs). If in doubt about the
correct tightness, have them checked with a torque wrench
by your authorized dealer or at a service station.
10. Lower the jack to it's fully closed position.
WARNING!
A loose tire or jack, thrown forward in a collision or
hard stop could endanger the occupants of the ve-
hicle. Always stow the jack parts and the spare tire in
the places provided.
11. Secure the tire, jack, and tools in their proper loca-
tions.
NOTE:Tire should be stowed with the ªbeautyº side
up. Storing the tire upside down may result in scratching
or damage to the wheel face. Continue winching up the
WHAT TO DO IN EMERGENCIES 377
6

tire until you hear the winch ªratchetº three times.
Double check to ensure the tire is snug against the
underbody of the vehicle. Damage to the winch cable
may result if the vehicle is driven with the tire loose.
WARNING!
Do not use power tools to winch the tire up or down.
Impact type tools may damage the winch mechanism.
12. Reinstall the plastic plug into the floor of the cargo
area.
JUMP STARTING
If the vehicle has a discharged battery, booster cables may
be used to obtain a start from a booster battery or the
battery in another vehicle. This type of start can be
dangerous if done improperly, so follow this procedure
carefully.
WARNING!
Battery fluid is a corrosive acid solution; do not allow
battery fluid to contact eyes, skin or clothing. Don't
lean over battery when attaching clamps or allow the
clamps to touch each other. If acid splashes in eyes or
on skin, flush contaminated area immediately with
large quantities of water.
A battery generates hydrogen gas which is flam-
mable and explosive. Keep flame or spark away from
the vent holes.
Do not use a booster battery or any other booster
source that has a greater than 12 volt system, i.e. Do
not use a 24 volt power source.
378 WHAT TO DO IN EMERGENCIES

1. Remove all metal jewelry such as watch bands or
bracelets which might make an unintended electrical
contact.
2. Park the booster vehicle within cable reach but with-
out letting the vehicles touch. Set the parking brake on
both vehicles, place the transmission in P (Park), and turn
the ignition OFF.
3. Turn off the heater, radio, and all unnecessary electri-
cal loads.
4. Connect one end of a jumper cable to the positive
terminal of the booster battery. Connect the other end of
the same cable to the positive terminal of the discharged
battery.WARNING!
Do not permit vehicles to touch each other as this
could establish a ground connection and personal
injury could result.
5. Connect the other cable, first to the negative terminal
of the booster battery and then to the engine of the
vehicle with the discharged battery. Make sure you have
a good contact on the engine.
6. Start the engine in the vehicle which has the booster
battery, let the engine idle a few minutes, then start the
engine in the vehicle with the discharged battery.
7. When removing the jumper cables, reverse the above
sequence exactly. Be careful of the moving belts and fan.
WHAT TO DO IN EMERGENCIES 379
6

WARNING!
Any procedure other than above could result in:
1. Personal injury caused by electrolyte squirting out
the battery vent;
2. Personal injury or property damage due to battery
explosion;
3. Damage to charging system of booster vehicle or
of immobilized vehicle.
WARNING!
²You should not try to start your vehicle by pushing
or towing.
²Do not connect the cable to the negative post of the
discharge battery. The resulting electrical spark
could cause the battery to explode.
²During cold weather when temperatures are be-
low freezing point, electrolyte in a discharged
battery may freeze. Do not attempt jump starting
because the battery could rupture or explode. The
battery temperature must be brought up above
freezing point before attempting jump start.
380 WHAT TO DO IN EMERGENCIES

EMERGENCY TOW HOOKS Ð IF EQUIPPED
If your vehicle is equipped with tow hooks, there will be
one in the rear and two mounted on the front of the
vehicle. The rear hook will be located on the driver's side
of the vehicle.
NOTE:For off-road recovery, it is recommended to use
both of the front tow hooks to minimize the risk of
damage to the vehicle.CAUTION!
Tow hooks are for emergency use only, to rescue a
vehicle stranded off road. Do not use tow hooks for
tow truck hookup or highway towing. You could
damage your vehicle.
WARNING!
Stand clear of vehicles when pulling with tow hooks.
Tow straps and chains may break, causing serious
injury.
WHAT TO DO IN EMERGENCIES 381
6

TOWING A DISABLED VEHICLE
2WD Models Only
Provided the transmission is operable, tow only in N
(Neutral) at speeds not exceeding 30 mph (48 km/h), for
distances of not more than 15 miles (24 km). Towing at
more than 30 mph (48 km/h) or for more than 15 miles
(24 km) can cause severe transmission damage. If the
transmission is not operable, or the vehicle must be
towed faster than 30 mph (48 km/h) or farther than 15
miles (24 km), remove the driveshaft or tow with all four
wheelsOFFthe ground. Acceptable methods are to tow
the vehicle on a flatbed or with one end of the vehicle
raised and the other end on a towing dolly.
4WD Models Only
The manufacturer recommends towing with all four
wheelsOFFthe ground. Acceptable methods are to tow
the vehicle on a flatbed or with one end of the vehicle
raised and the other end on a towing dolly.
382 WHAT TO DO IN EMERGENCIES

MAINTAINING YOUR VEHICLE
CONTENTS
mEngine Compartment ± 3.7L...............386
mEngine Compartment ± 4.7L...............387
mEngine Compartment ± 5.7L...............388
mEngine Compartment ± 3.0L Diesel..........389
mOnboard Diagnostic System Ð OBD II........390
NLoose Fuel Filler Cap Message............391
mEmissions Inspection And Maintenance
Programs............................391
mReplacement Parts......................393mDealer Service.........................393
mMaintenance Procedures..................394
NEngine Oil..........................394
NDrive Belts Ð Check Condition And Tension . . 398
NSpark Plugs.........................398
NSpark Plug Wires.....................398
NEngine Air Cleaner Filter................398
NCatalytic Converter....................399
NCrankcase Emission Control System........400
7

NMaintenance-Free Battery................401
NAir Conditioner Maintenance.............402
NPower Steering Fluid Check..............403
NBody Lubrication.....................405
NWindshield Wiper Blades................405
NWindshield Washers Ð Front And Rear.....405
NExhaust System......................406
NCooling System.......................407
NHoses And Vacuum/Vapor Harnesses.......412
NFuel System Connections................412
NBrake System........................413
NFront/Rear Axle Fluid..................415
NTransfer Case........................416NAutomatic Transmission................417
NMaintenance After Off-Road Driving........420
NAppearance Care And Protection From
Corrosion...........................421
mFuse Panel...........................426
NInterior Fuses........................426
NUnderhood Fuses (Power Distribution
Center)............................429
NUnderhood Fuses (Integrated Power
Module)............................432
mVehicle Storage........................433
mReplacement Bulbs......................434
mBulb Replacement......................435
384 MAINTAINING YOUR VEHICLE