2009 Mercury Mountaineer towing

2. Weigh your vehicle without cargo. To obtain correct weights, take your
vehicle to a shipping company or an inspection station for trucks.
3. Subtract your loaded weight from the maximum GCWR in the chart.
This is the maximum trailer weight your vehicle can tow. It must be
below the maximum trailer weight shown in the chart.
TRAILER TOWING
Trailer towing with your vehicle may require the use of a trailer tow
option package.
Trailer towing puts additional loads on your vehicle’s engine,
transmission, axle, brakes, tires, and suspension. For your safety and to
maximize vehicle performance, be sure to use the proper equipment
while towing.
Follow these guidelines to ensure safe towing procedure:
•Do not tow a trailer until your vehicle has been driven at least
1,000 miles (1,600 km).
•Stay within your vehicle’s load limits.
•Thoroughly prepare your vehicle for towing. Refer toPreparing to
towin this chapter.
•Use extra caution when driving while trailer towing. Refer toDriving
while you towin this chapter.
•Service your vehicle more frequently if you tow a trailer. Refer to the
severe duty schedule in the scheduled maintenance guide.
•Refer to the instructions included with towing accessories for the
proper installation and adjustment specifications.
Do not exceed the maximum loads listed on the Safety Compliance
Certification label. For load specification terms found on the label, refer
toVehicle loadingin this chapter when figuring the total weight of your
vehicle.
Your vehicle is equipped with a standard Class II integrated hitch and
requires only a draw bar and ball with a 3/4 inch (19 mm) shank
diameter. An optional Class III/Class IV hitch is also available.
Note:Do not exceed the GVWR or the GAWR specified on the Safety
Compliance Certification Label.
2009 Mountaineer(mnt)
Owners Guide, 2nd Printing
USA(fus)
Tires, Wheels and Loading
254

WARNING:Towing trailers beyond the maximum recommended
gross trailer weight exceeds the limit of the vehicle and could
result in engine damage, transmission damage, structural damage, loss
of vehicle control, vehicle rollover and personal injury.
4x2
GCWR (Gross Combined Weight Rating)/Trailer Weight
Engine Rear axle ratio Maximum
GCWR-lb. (kg)Trailer weight
range-lb. (kg)
(0-Maximum)
4.0L SOHC Class
II towing3.55 8500 (3856) 0–3500 (0–1588)
4.6L* Class II
towing3.55 8500 (3856) 0–3500 (0–1588)
4.0L SOHC Class
III/IV Towing3.73 10000 (4536) 0–5305 (0–2406)
4.6L* Class III/IV
Towing3.55 12000 (5443) 0–7215 (0–3273)
Notes:- For high altitude operation, reduce GCW by 2% per 1,000 ft.
(300 meters) elevation. For definitions of terms used in this table and
instructions on how to calculate your vehicle load, refer toVehicle
loadingin this chapter. Maximum trailer weights shown. The combined
weight of the completed towing vehicle and the loaded trailer must not
exceed the GCWR.
* -When towing maximum loads under high outside temperatures and
on steep grades, the A/C system may cycle on and off to protect the
engine from overheating. This may result in a temporary increase of
interior temperatures.
2009 Mountaineer(mnt)
Owners Guide, 2nd Printing
USA(fus)
Tires, Wheels and Loading
255

AW D
GCWR (Gross Combined Weight Rating)/Trailer Weight
Engine Rear axle ratio Maximum
GCWR-lb. (kg)Trailer weight
range-lb. (kg)
(0-Maximum)
4.0L SOHC Class
II towing3.55 8500 (3856) 0–3500 (0–1588)
4.6L* Class II
towing3.55 8500 (3856) 0–3500 (0–1588)
4.0L SOHC Class
III/IV Towing3.73 10000 (4536) 0–5000 (0–2268)
4.6L* Class III/IV
Towing3.55 12000 (5443) 0–7040 (0–3193)
Notes:- For high altitude operation, reduce GCW by 2% per 1,000 ft.
(300 meters) elevation. For definitions of terms used in this table and
instructions on how to calculate your vehicle load, refer toVehicle
loadingin this chapter. Maximum trailer weights shown. The combined
weight of the completed towing vehicle and the loaded trailer must not
exceed the GCWR.
* -When towing maximum loads under high outside temperatures and
on steep grades, the A/C system may cycle on and off to protect the
engine from overheating. This may result in a temporary increase of
interior temperatures.
Preparing to tow
Use the proper equipment for towing a trailer and make sure it is
properly attached to your vehicle. Contact your authorized dealer or a
reliable trailer dealer as soon as possible if you require assistance.
Hitches
Do not use hitches that clamp onto the vehicle bumper. Use a load
carrying hitch. You must distribute the load in your trailer so that
10–15% of the total weight of the trailer is on the tongue, not to exceed
the maximum tongue loads as stated:
•Class II receiver: 350 lb. (159 kg)
•Class III/IV receiver: 500 lb. (227 kg) (weight carrying); 740 lb.
(336 kg) (weight distributing)
2009 Mountaineer(mnt)
Owners Guide, 2nd Printing
USA(fus)
Tires, Wheels and Loading
256

WARNING:Never connect any trailer lighting to the vehicle’s
taillamp circuits, because it may damage the electrical system
resulting in fire. Contact your authorized dealer as soon as possible for
assistance in proper trailer tow wiring installation. Additional electrical
equipment may be required.
Driving while you tow
When towing a trailer:
•To ensure proper “break-in” of powertrain components, do not trailer
tow during the first 1,000 miles (1,600 km) of a new vehicle.
•To ensure proper “break-in” of powertrain components during the first
500 miles (800 km) of trailer towing, drive no faster than 70 mph
(113 km/h) with no full throttle starts.
•Turn off the speed control. The speed control may shut off
automatically when you are towing on long, steep grades.
•Consult your local motor vehicle speed regulations for towing a trailer.
•To eliminate excessive shifting, use a lower gear. This will also assist
in transmission cooling. For additional information, refer toAutomatic
transmission operationin theDrivingchapter.
•Under extreme conditions with large frontal trailers, high outside
temperatures and highway speeds, the coolant gauge may indicate
higher than normal coolant temperatures. If this occurs, reduce speed
until the coolant temperature returns to the normal range. Refer to
Engine coolant temperature gaugein theInstrument Cluster
chapter.
•Anticipate stops and brake gradually.
•Do not exceed the GCWR rating or transmission damage may occur.
Servicing after towing
If you tow a trailer for long distances, your vehicle will require more
frequent service intervals. Refer to yourscheduled maintenance
informationfor more information.
Trailer towing tips
•Practice turning, stopping and backing up before starting on a trip to
get the feel of the vehicle trailer combination. When turning, make
wider turns so the trailer wheels will clear curbs and other obstacles.
•Allow more distance for stopping with a trailer attached.
2009 Mountaineer(mnt)
Owners Guide, 2nd Printing
USA(fus)
Tires, Wheels and Loading
258

•If you are driving down a long or steep hill, shift to a lower gear. Do
not apply the brakes continuously, as they may overheat and become
less effective.
•The trailer tongue weight should be 10–15% of the loaded trailer
weight.
•If you will be towing a trailer frequently in hot weather, hilly
conditions, at GCWR, or any combination of these factors, consider
refilling your rear axle with synthetic gear lube if not already so
equipped. Refer to theMaintenance and Specificationschapter for
the lubricant specification. Remember that regardless of the rear axle
lube used, do not tow a trailer for the first 1,000 miles (1,600 km) of a
new vehicle, and that the first 500 miles (800 km) of towing be done
at no faster than 70 mph (113 km/h) with no full throttle starts.
•After you have traveled 50 miles (80 km), thoroughly check your
hitch, electrical connections and trailer wheel lug nuts.
•To aid in engine/transmission cooling and A/C efficiency during hot
weather while stopped in traffic, place the gearshift lever in P (Park).
•Vehicles with trailers should not be parked on a grade. If you must
park on a grade, place wheel chocks under the trailer’s wheels.
Launching or retrieving a boat
Disconnect the wiring to the trailer before backing the trailer
into the water. Reconnect the wiring to the trailer after the
trailer is removed from the water.
When backing down a ramp during boat launching or retrieval:
•do not allow the static water level to rise above the bottom edge of
the rear bumper.
•do not allow waves to break higher than 6 inches (15 cm) above the
bottom edge of the rear bumper.
Exceeding these limits may allow water to enter vehicle components:
•causing internal damage to the components.
•affecting driveability, emissions and reliability.
Replace the rear axle lubricant any time the axle has been submerged in
water. Rear axle lubricant quantities are not to be checked or changed
unless a leak is suspected or repair required.
RECREATIONAL TOWING
Follow this guidelines if you have a need for recreational towing. An
example of recreational towing would be towing your vehicle behind a
motorhome. These guidelines are designed to ensure that your
transmission is not damaged.
2009 Mountaineer(mnt)
Owners Guide, 2nd Printing
USA(fus)
Tires, Wheels and Loading
259

Note:Put your climate control system in recirculated air mode to
prevent exhaust fumes from entering the vehicle. Refer to theClimate
controlschapter for more information.
All vehicles:Do not tow your vehicle with any wheels on the ground, as
vehicle or transmission damage may occur. It is recommended to tow
your vehicle with all four (4) wheels off the ground such as when using a
car-hauling trailer. Otherwise, no recreational towing is permitted.
In case of a roadside emergency with a disabled vehicle, seeWrecker
towingin theRoadside Emergencieschapter.
2009 Mountaineer(mnt)
Owners Guide, 2nd Printing
USA(fus)
Tires, Wheels and Loading
260

Certain adverse driving maneuvers may activate the Electronic Stability
Control system, which include but are not limited to:
•Taking a turn too fast
•Maneuvering quickly to avoid an accident, pedestrian or obstacle
•Driving over a patch of ice or other slippery surfaces
•Changing lanes on a snow-rutted road
•Entering a snow-free road from a snow-covered side street, or vice
versa
•Entering a paved road from a gravel road, or vice versa
•Cornering while towing a heavily loaded trailer (refer toTrailer
towingin theTires, Wheels and Loadingchapter).
The Electronic Stability Control system may be deactivated in certain
situations. See theSwitching Off AdvanceTrac
with RSC
section
following.
Roll Stability Control™ (RSC
)
Roll Stability Control (RSC
) may help to maintain roll stability of the
vehicle during adverse maneuvers. RSC
operates by detecting the
vehicle’s roll motion and the rate at which it changes and by applying the
brakes to one or more wheels individually.
During an event that activates the Roll Stability Control™ (RSC
)the
“sliding car” icon
in the instrument cluster will flash.
Certain adverse driving maneuvers may activate the Roll Stability Control
system, which include:
•Emergency lane-change
•Taking a turn too fast
•Quick maneuvering to avoid an accident, pedestrian or obstacle
The Roll Stability Control system may be deactivated in certain
situations. See theSwitching Off AdvanceTrac
with RSC
section
following.
Switching Off AdvanceTrac
with RSC

If the vehicle is stuck in snow, mud or sand, and seems to lose engine
power, switching off certain features of the AdvanceTrac
with RSC

system may be beneficial because the wheels are allowed to spin. This
will restore full engine power and will enhance momentum through the
obstacle. To switch off the AdvanceTrac
with RSC
system press the
AdvanceTrac
with RSC
Offbutton. Full features of the AdvanceTrac

2009 Mountaineer(mnt)
Owners Guide, 2nd Printing
USA(fus)
Driving
272

with RSC
system can be restored by pressing the AdvanceTrac
with
RSC
Offbutton again or by turning off and restarting the engine.
If you switch off the AdvanceTrac
with RSC
system, the sliding car
icon
will illuminate steadily. Pressing the AdvanceTrac
with RSC

Offbutton again will turn off thesliding caricon
.
In R (Reverse), ABS and the Engine and Brake Traction Control features
will continue to function; however, ESC and RSC
are disabled.
AdvanceTrac
with RSC
Features
Button
functions“Sliding
car”
icon
RSC
ESCEngine
Traction
ControlBrake
Traction
Control
Default at
start-upOff Enabled Enabled Enabled Enabled
Button
pressed
momentarilyIlluminated
solidDisabled
below
25 mph
(40 km/h)Disabled
below
25 mph
(40 km/h)Disabled
below
25 mph
(40 km/h)Enabled
Button
pressed and
held more
than five
secondsFlashes
then
illuminated
solidDisabled
below
25 mph
(40 km/h)Disabled
below
25 mph
(40 km/h)Disabled
below
25 mph
(40 km/h)Disabled
below
25 mph
(40 km/h)
Trailer Sway Control
When properly equipped, trailer sway control will use the vehicle’s
AdvanceTrac
with RSC
system to detect and help reduce trailer sway
by applying brake force at individual wheels and, if necessary, by
reducing engine power. Trailer sway control is only enabled above
40 mph (64 km/h).
WARNING:Trailer sway control does not prevent a trailer from
swaying, it mitigates the sway from increasing once it has
occurred. If you are experiencing trailer sway it is likely that the trailer
is improperly loaded for the correct tongue weight or the speed of the
vehicle and trailer is too high. Pull the vehicle-trailer over to a safe
location to check the trailer weight distribution and tongue load and
reduce speed to a safe level while towing. If trailer sway is
experienced, SLOW DOWN.
2009 Mountaineer(mnt)
Owners Guide, 2nd Printing
USA(fus)
Driving
273