1998 FORD EXPEDITION lock

cleaning them, and apply a small
quantity of grease to the top of
each battery terminal to help
prevent corrosion.
If your battery has a
cover/shield, make sure it is
reinstalled after the battery is
replaced.
Because your vehicle's engine is
electronically controlled by a
computer, some control conditions
are maintained by power from the
battery. When the battery is
disconnected or a new battery is
installed, the engine must relearn
its idle conditions before your
vehicle will drive properly. To
begin this process:
1. Put the gearshift in P (Park),
turn off all accessories and start
the vehicle.
2. Let the engine idle for at least
one minute.
3. The relearning process will
automatically complete as you
drive the vehicle.
²If you do not allow the engine to
relearn its idle, the idle quality
of your vehicle may be adversely
affected until the idle is
eventually relearned.
²If the battery has been
disconnected or a new battery
has been installed, the clock and
the preset radio stations must
be reset once the battery is
reconnected.
Maintenance and care
169

For information on replacement air
filter elements, refer to the
Capacities and specifications
chapter.
WINDSHIELD WIPER BLADES
Check the wiper blades at least
twice a year or when they seem
less effective. Substances such as
tree sap and some hot wax
treatments used by commercial car
washes reduce the effectiveness of
wiper blades.
Checking the wiper blades
If the wiper blades do not wipe
properly, clean both the windshield
and wiper blades using undiluted
windshield wiper solution or a mild
detergent. Rinse thoroughly with
clean water. To avoid damaging the
blades, do not use fuel, kerosene,
paint thinner or other solvents.
Changing the wiper blades
When replacing wiper blade
assemblies, always use a
Motorcraft part or equivalent. To
make replacing the wipers easy,
turn the ignition to ACC, then turn
the wipers on. When the wipers
reach the vertical position, turn
the ignition to LOCK.
To replace the wiper blades:
Maintenance and care
171

1. Pull the wiper arm away from
the windshield and lock into the
service position.
2. Turn the blade at an angle from
the wiper arm. Push the lock pin
with a screwdriver to release the
blade and pull the wiper blade
down toward the windshield to
remove it from the arm.
3. Attach the new wiper to the
wiper arm and press it into place
until a click is heard.
INFORMATION ABOUT TIRE
QUALITY GRADES
New vehicles are fitted with tires
that have their Tire Quality Grade
(described below) molded into the
tire's sidewall. These Tire Quality
Grades are determined by
standards that the United States
Department of Transportation has
set.
Tire Quality Grades apply to new
pneumatic tires for use on
passenger cars. They do not apply
to deep tread, winter-type snow
tires, space-saver or temporary use
spare tires, tires with nominal rim
diameters of 10 to 12 inches or
limited production tires as defined
in Title 49 Code of Federal
Regulations Part 575.104(c)(2).
Maintenance and care
172

recommend the use of gasolines
that meet the AAMA specification
if they are available.
It should not be necessary to add
any aftermarket products to your
fuel tank if you continue to use a
high-quality fuel.
Cleaner air
Ford approves the use of gasolines
to improve air quality, including
reformulated gasolines that contain
oxygenates up to 10% ethanol or
15% MTBE.
Do not use gasolines containing
methanol, which can damage
critical fuel system components.
Damage resulting from the use of
methanol may not be covered by
your warranty.
Filling the fuel tank
1. Turn the engine off. After
opening the fuel door, remove the
cap carefully and slowly by turning
it counterclockwise
1¤4turn until it
stops. Pull to remove the cap. A
tether attaches the cap to the fuel
filler pipe.
2. Make sure that you pump
unleaded fuel and put the fuel
nozzle inside the fuel filler pipe.
²To optimize fill, it may be
necessary to reposition the
nozzle in the filler pipe.
SNAPON
SNAPREM0VETHENPULLTO
Maintenance and care
181

²To help reduce early nozzle shut
off and fuel spillage, park your
vehicle so the fuel filler door is
level.
²Avoid excessively fast fuel
dispensing rates (over 38 L
[10 gallons] per minute).
²If you spill fuel on the body of
your vehicle, clean it off
immediately. The fuel may dull
or soften the paint if it is not
washed off promptly.
²To replace the fuel cap, align
the tabs on the cap with the
notches on the fuel filler pipe.
Turn it clockwise until it stops.
²Push the fuel door closed.
If the check engine warning light
illuminates and remains illuminated
while the engine is started, the
fuel cap may not be properly
seated. Turn off the engine,
remove the fuel cap and replace it,
being sure to align the cap
properly.
If the cap is lost, replace it with an
authorized Motorcraft or equivalent
part.
Calculating fuel economy
To accurately calculate your
vehicle's fuel economy:
1. Fill the tank completely and
record the initial odometer
reading.
2. Each time you fill the tank,
record the amount of fuel added
(in liters or gallons).
Maintenance and care
182

Replacing headlamp bulbs
Handle a halogen
headlamp bulb carefully
and keep out of children's reach.
Grasp the bulb only by its plastic
base and do not touch the glass.
The oil from your hand could
cause the bulb to break the next
time the headlamps are
operated.
1. Make sure that the headlamp
control is in the OFF position.
2. Open the hood.
3. At the back of the headlamp,
pull clips rearward and up (about
ôº) to release the headlamp
assembly.
4. Slide headlamp assembly
forward and off of guide ribs to
expose the back of the bulb and
wiring connector.
5. Remove the electrical connector
from the bulb by grasping the wire
and pulling it rearward.
6. Remove bulb retainer ring by
turning it counterclockwise about
1¤4turn, then slide the ring off the
plastic base.
7. Without turning, carefully pull
bulb assembly out of headlamp
assembly.
Maintenance and care
187

8. Insert the glass end of the new
bulb into the headlamp assembly
socket. When the grooves in the
plastic base are aligned, push the
bulb into the socket until the
plastic base contacts the rear of
the socket.
9. Slip bulb retaining ring over the
plastic base and lock the ring into
the socket by turning it clockwise
until you feel a ªstop.º
10. Push the electrical connector
into the rear of the plastic base
until it ªsnaps.º
11. Straighten alignment pins,
making them parallel with the
outer edges of the attachment
standoff.
12. Carefully insert the headlamp
assembly into the vehicle making
sure the alignment pins are
inserted into the proper holes and
into the guide ribs.
13. Hold the headlamp assembly
snugly against the vehicle and
push down on the clips to lock the
lamp into position.
Maintenance and care
188

Replacing parking lamp/turn
signal bulbs
1. Remove screw from the top of
lamp assembly.
2. Disengage lamp assembly (it has
a snap fit).
3. Remove the electrical connector
from the bulb by grasping the wire
and pulling it rearward.
4. Remove bulb retainer ring by
turning it counterclockwise about
1/4 turn, then slide the ring off the
plastic base.
5. Without turning, carefully pull
bulb assembly out of parking lamp
assembly.
6. Insert the glass end of the new
bulb into the parking lamp
assembly socket. When the grooves
in the plastic base are aligned,
push the bulb into the socket until
the plastic base contacts the rear
of the socket.
7. Slip bulb retaining ring over the
plastic base and lock the ring into
the socket by turning it clockwise
until you feel a ªstop.º
8. Push the electrical connector
into the rear of the plastic base
until it ªsnaps.º
Maintenance and care
189