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Message center indicator lights
Check air suspension
Briefly illuminates when the ignition
is turned ON. This light will remain
on to indicate that the air
suspension switch is off or to
indicate a possible system fault. For
more information on the air
suspension system, refer to the
Drivingchapter.
Overdrive off
Illuminates when the transmission
control switch (TCS) has been
pushed. When the light is on, the
transmission does not shift into
overdrive. If the light does not come
on when the TCS is depressed or if
the light flashes when you are
driving, have your vehicle serviced.
Door ajar
Illuminates when one of the doors is
not completely shut and the ignition
is turned to ON. With the ignition
ON, this light will flash five times
and sound a tone for one second,
then remain on (if a door is open).
Low washer fluid
Momentarily illuminates when the
ignition is turned to ON and will
stay on when the windshield washer
fluid is low.
CHECK
TRUNK AJAR LTR/100 kmAIR SUSPENSION
OVERDRIVE OFFDOOR
AJAR
LOW
WASHER
FLUID
km
MILES
/GAL
CHECK
TRUNK AJAR LTR/100 kmAIR SUSPENSION
OVERDRIVE OFFDOOR
AJAR
LOW
WASHER
FLUID
km
MILES
/GAL
CHECK
TRUNK AJAR LTR/100 kmAIR SUSPENSION
OVERDRIVE OFFDOOR
AJAR
LOW
WASHER
FLUID
km
MILES
/GAL
CHECK
TRUNK AJAR LTR/100 kmAIR SUSPENSION
OVERDRIVE OFFDOOR
AJAR
LOW
WASHER
FLUID
km
MILES
/GAL
Instrumentation
21
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1 (First)
Use 1 (Low) to provide maximum
engine braking on steep
downgrades. Upshifts can be made
by shifting to 2 (Second) or to
Overdrive. Selecting 1 (Low) at
higher speeds causes the transmission to shift to a lower gear, and will
shift to 1 (Low) after vehicle decelerates to the proper speed.
VEHICLE LOADING
Before loading a vehicle, familiarize yourself with the following terms:
²Base Curb Weight: Weight of the vehicle including any standard
equipment, fluids, lubricants, etc. It does not include passengers or
aftermarket equipment.
²Payload: Combined maximum allowable weight of cargo, passengers
and optional equipment. The payload equals the gross vehicle weight
rating minus base curb weight.
²GVW (Gross Vehicle Weight): Base curb weight plus payload
weight. The GVW is not a limit or a specification.
²GVWR (Gross Vehicle Weight Rating): Maximum total weight of
the base vehicle, passengers, optional equipment and cargo. The
GVWR is specific to each vehicle and is listed on the Safety
Compliance Label on the driver's door pillar.
²GAWR (Gross Axle Weight Rating): Carrying capacity for each
axle system. The GAWR is specific to each vehicle and is listed on the
Safety Compliance Label on the driver's door pillar.
²GCW (Gross Combined Weight): The combined weight of the
towing vehicle (including passengers and cargo) and the trailer.
²GCWR (Gross Combined Weight Rating): Maximum combined
weight of the towing vehicle (including passengers and cargo) and the
trailer. The GCWR indicates the maximum loaded weight that the
vehicle is designed to tow.
²Maximum Trailer Weight Rating: Maximum weight of a trailer the
vehicle is permitted to tow. The maximum trailer weight rating is
determined by subtracting the vehicle curb weight for each
engine/transmission combination, any required option weight for trailer
towing and the weight of the driver from the GCWR for the towing
vehicle.
Driving
115
Page 124 of 200

Fuse/Relay
LocationFuse Amp
RatingDescription
10 10A Air Bag Module
11 5A Radio
12 18A CB Lighting Control Module, Flash-to-Pass,
Main Light Switch
13 15A Warning Lamps, Analog Cluster Gauges and
Indicators, Electronic Automatic
Transmission, Lighting Control Module
14 20A CB Window/Door Lock Control, Driver's Door
Module, One Touch Down
15 10A Anti-Lock Brakes, Instrument Cluster,
Transmission Control Switch
16 20A Cigar Lighter
17 10A Rear Defrost
18 10A Air Bag Module
Power distribution box
The power distribution box is located in the engine compartment. The
power distribution box contains high-current fuses that protect your
vehicle's main electrical systems from overloads.
Always disconnect the battery before servicing high current
fuses.
Always replace the cover to the Power Distribution Box before
reconnecting the battery or refilling fluid reservoirs.
If the battery has been disconnected and reconnected, refer to the
Batterysection of theMaintenance and Carechapter.
Roadside emergencies
124
Page 138 of 200
IDENTIFYING COMPONENTS IN THE ENGINE COMPARTMENT
4.6L SOHC V8 engine
1. Brake fluid reservoir
2. Engine oil dipstick
3. Engine oil filler cap
4. Windshield washer fluid reservoir
5. Air filter assembly
6. Power steering fluid reservoir
7. Engine coolant reservoir
8. Battery
9. Automatic transmission fluid dipstick
912
3
6578
4
Maintenance and care
138
Page 147 of 200

CHECKING AND ADDING POWER STEERING FLUID
Check the power steering fluid.
Refer to the Scheduled Maintenance
Guide for the service interval
schedules. If adding fluid is
necessary, use only MERCONtAT F.
1. Start the engine and let it run until it reaches normal operating
temperature (the engine coolant temperature gauge indicator will be
near the center of the normal area between H and C).
2. While the engine idles, turn the steering wheel left and right several
times.
3. Turn the engine off.
4. Check the fluid level in the
reservoir. It should be between the
MIN and MAX lines. Do not add
fluid if the level is in this range.
5. If the fluid is low, add fluid in small amounts, continuously checking
the level until it reaches the range between the MIN and MAX lines. Be
sure to put the cap back on the reservoir.
TRANSMISSION FLUID
Checking automatic transmission fluid
Refer to your Scheduled Maintenance Guide for scheduled intervals for
fluid checks and changes. Your transmission does not consume fluid.
However, the fluid level should be checked if the transmission is not
working properly, i.e., if the transmission slips or shifts slowly or if you
notice some sign of fluid leakage.
DONOTOVERFILLPOWERSTEERINGFLUID
MAX
MIN
Maintenance and care
147
Page 148 of 200
![Mercury Grand Marquis 1999 Owners Manuals Automatic transmission fluid expands when warmed. To obtain an
accurate fluid check, drive the vehicle until it is at normal operating
temperature (approximately 30 km [20 miles]). If your vehicle has Mercury Grand Marquis 1999 Owners Manuals Automatic transmission fluid expands when warmed. To obtain an
accurate fluid check, drive the vehicle until it is at normal operating
temperature (approximately 30 km [20 miles]). If your vehicle has](/manual-img/33/10919/w960_10919-147.png)
Automatic transmission fluid expands when warmed. To obtain an
accurate fluid check, drive the vehicle until it is at normal operating
temperature (approximately 30 km [20 miles]). If your vehicle has been
operated for an extended period at high speeds, in city traffic during hot
weather or pulling a trailer, the vehicle should be turned off for about 30
minutes to allow fluid to cool before checking.
1. Drive the vehicle 30 km (20 miles) or until it reaches normal operating
temperature.
2. Park the vehicle on a level surface and engage the parking brake.
3. With the parking brake engaged and your foot on the brake pedal,
start the engine and move the gearshift lever through all of the gear
ranges. Allow sufficient time for each gear to engage.
4. Latch the gearshift lever in P (Park) and leave the engine running.
5. Remove the dipstick, wiping it clean with a clean, dry lint free rag.
6. Install the dipstick making sure it is fully seated in the filler tube.
7. Remove the dipstick and inspect the fluid level. The fluid should be in
the designated area for normal operating temperature (H) or ambient
temperature (C).
Low fluid level
Do not drive the vehicle if the fluid
level is at the bottom of the dipstick
and the ambient temperature is
above 10ÉC (50ÉF).
Correct fluid level
The transmission fluid should be checked at normal operating
temperature 66ÉC-77ÉC (150ÉF-170ÉF) on a level surface. The normal
operating temperature can be reached after approximately 30 km
(20 miles) of driving.
You can check the fluid without driving if the ambient temperature is
above 10ÉC (50ÉF). However, if fluid is added at this time, an overfill
condition could result when the vehicle reaches normal operating
temperature.
The transmission fluid should be in
this range if at normal operating
temperature (66ÉC-77ÉC
[150ÉF-170ÉF]).
DON’T ADD
DON’T ADD
Maintenance and care
148
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![Mercury Grand Marquis 1999 Owners Manuals The transmission fluid should be in
this range if at ambient temperature
(10ÉC-35ÉC [50ÉF-95ÉF]).
High fluid level
Fluid levels above the safe range
may result in transmission failure.
An overfill Mercury Grand Marquis 1999 Owners Manuals The transmission fluid should be in
this range if at ambient temperature
(10ÉC-35ÉC [50ÉF-95ÉF]).
High fluid level
Fluid levels above the safe range
may result in transmission failure.
An overfill](/manual-img/33/10919/w960_10919-148.png)
The transmission fluid should be in
this range if at ambient temperature
(10ÉC-35ÉC [50ÉF-95ÉF]).
High fluid level
Fluid levels above the safe range
may result in transmission failure.
An overfill condition of transmission
fluid may cause shift and/or
engagement concerns and/or
possible damage.
High fluid levels can be caused by
an overheating condition.
Adjusting automatic transmission fluid levels
Before adding any fluid, make sure the correct type is used. The type of
fluid used is normally indicated on the dipstick and/or dipstick handle
and also in theLubricant specificationssection in theCapacities and
specificationschapter.
Use of a non-approved automatic transmission fluid may cause
internal transmission component damage.
If necessary, add fluid in 250 mL (1/2 pint) increments through the filler
tube until the level is correct.
If an overfill occurs, excess fluid
should be removed by a qualified
technician.
An overfill condition of
transmission fluid may cause
shift and/or engagement
concerns and/or possible
damage.
DON’T ADD
DON’T ADD
DON’T ADD
Maintenance and care
149
Page 175 of 200

MOTORCRAFT PART NUMBERS
Component 4.6L SOHC V8 engine
Air filter element FA-1668
Fuel filter FG-986B
Battery (standard) BXT-59
Battery (optional) BXT-65-650
Oil filter FL-820-S
PCV valve EV-98
Spark plugs* AWSF-32P
* Refer to Vehicle Emissions Control Information (VECI) decal for spark
plug gap information.
REFILL CAPACITIES
Fluid Ford Part Name Capacity
Engine oil (includes
filter change)Motorcraft 5W-30 Super
Premium Motor Oil4.7L
(5.0 quarts)
Brake fluid High Performance DOT 3
Motor Vehicle Brake FluidFill to line on
reservoir
Power steering fluid Motorcraft MERCONtATF Fill to line on
reservoir
Transmission fluid Motorcraft MERCONtV ATF 13.1L
(13.9 quarts)
Engine coolant
1Premium Engine Coolant 15.0L
(15.8 quarts)
Fuel tank N/A 71.9L
(19.0 gallons)
Rear axle lubricant
2Motorcraft SAE 80W90
Premium Rear Axle Lubricant1.8-1.9L
(3.75-4.0 pints)
Windshield washer
fluidUltra-Clear Windshield
Washer ConcentrateFill to line on
reservoir
1Use Ford Premium Engine Coolant (green in color). DO NOT USE Ford
Extended Life Engine Coolant (orange in color). Refer toAdding engine
coolant, in the Maintenance and Care chapter.
2Rear axles are considered lubricated for life when the vehicle is used
for normal service. See your Scheduled Maintenance Guide for Severe
Duty requirements. Traction-Lok axles use 2.2±2.4L (4.75±5.0 pints) of
Capacities and specifications
175