Page 377 of 397
Changing the air filter element
3.5L V6
3.5L V6 (EcoBoost)
1. Release the clamps that secure the air filter housing cover.
2. Carefully separate the two halves of the air filter housing.
3. Remove the air filter element from the air filter housing.
4. Wipe the air filter housing and cover clean to remove any dirt or
debris and to ensure good sealing.
5. Install a new air filter element. Be careful not to crimp the filter
element edges between the air filter housing and cover. This could cause
filter damage and allow unfiltered air to enter the engine if not properly
seated.
Maintenance and Specifications
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6. Replace the air filter housing
cover and secure the clamps. Be
sure that the air cleaner cover tabs
are engaged into the slots of the air
cleaner housing.
Note:Failure to use the correct air filter element may result in severe
engine damage. The customer warranty may be void for any damage to
the engine if the correct air filter element is not used.
MOTORCRAFT PART NUMBERS
Component 3.5L V6 engine 3.5L V6 EcoBoost
engine
Engine air filter
elementFA-1884 FA-1884
Battery BXT-65-750 BXT-65-750
Oil filter FL-500-S FL-500-S
Spark Plugs SP-411
1SP-5121
1
For spark plug replacement, see your authorized dealer. Refer to
scheduled maintenance informationfor the appropriate intervals for
changing the spark plugs.
Replace the spark plugs with ones that meet Ford material and
design specifications for your vehicle, such as Motorcraftor
equivalent replacement parts. The customer warranty may be
void for any damage to the engine if such spark plugs are not
used.
Maintenance and Specifications
378
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Page 391 of 397

A
Accessory delay ........................102
Active Park Assist .....................280
AdvanceTrac ..............................262
Air cleaner filter ...............376–378
Air conditioning ..............68, 71, 74
manual heating and air
conditioning system .................68
Airbag supplemental restraint
system ................184–185, 193, 195
and child safety seats ............186
description ..............185, 193, 195
disposal ....................................199
driver airbag ............187, 194, 196
indicator light .................193, 198
operation .................187, 194, 196
passenger airbag .....187, 194, 196
side airbag ...............................193
All Wheel Drive (AWD),
driving off road .........................285
Ambient mood/lighting ...............85
AM/FM .........................................28
Antifreeze
(see Engine coolant) ................354
Anti-lock brake system
(see Brakes) ..............................260
Anti-theft system ..............140, 149
arming the system ..................149
disarming a triggered
system .....................................150
Audio system (see Radio) .........28
Automatic transaxle
fluid, refill capacities ..............379
fluid, specification ..................379Automatic transmission
driving an automatic
overdrive .........................271, 273
fluid, adding ............................374
fluid, checking ........................374
Selectshift (SST) ....................275
Auxiliary input jack (Line in) ....37
B
Battery .......................................352
acid, treating emergencies .....352
jumping a disabled battery ....319
maintenance-free ....................352
replacement, specifications ...378
servicing ..................................352
Belt-Minder.............................180
Booster seats .............................213
Brakes ........................................260
anti-lock ...................................260
anti-lock brake system (ABS)
warning light ...........................261
fluid, checking and adding ....374
fluid, refill capacities ..............379
fluid, specifications .................379
lubricant specifications ..........379
parking ....................................261
shift interlock ..........................269
Bulbs ............................................86
C
Capacities for refilling fluids ....379
Car2UHome Automation
System .......................................113
Cargo net ...................................124
CD ................................................28
Cell phone use ..............................9
Changing a tire .........................302
Index
391
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Owners Guide, 1st Printing
USA(fus)
Page 393 of 397

Engine ........................................382
cleaning ...................................336
coolant .....................................354
fail-safe cooling .......................359
idle speed control ...................352
lubrication specifications .......379
refill capacities ........................379
service points ..................345–346
Engine block heater .................258
Engine oil ..................................349
change oil soon warning,
message center .......................349
checking and adding ..............349
dipstick ....................................349
filter, specifications ........351, 378
recommendations ...................351
refill capacities ........................379
specifications ..........................379
Event data recording ....................7
Exhaust fumes ..........................258
F
Fail safe cooling ........................359
Family entertainment system ....46
Fleet MyKey programming ......143
Fluid capacities .........................379
Fog lamps ....................................81
Four-Wheel Drive vehicles
driving off road .......................286
Freezer ........................................97
Fuel ............................................361
calculating fuel
economy ............................20, 367
cap ...........................................363
capacity ...................................379
choosing the right fuel ...........364comparisons with EPA fuel
economy estimates .................370
detergent in fuel .....................365
filler funnel .............................365
filling your vehicle with
fuel ...........................361, 363, 367
filter, specifications ........361, 378
fuel pump shut-off ..................294
improving fuel economy ........367
octane rating ...................364, 382
quality ......................................365
running out of fuel .........319, 365
safety information relating to
automotive fuels .....................361
Fuses ..........................................294
G
Garage door opener ..................109
Gas cap (see Fuel cap) ............363
Gas mileage
(see Fuel economy) .................367
Gauges .........................................16
H
Hazard flashers .........................293
Head restraints .................160, 162
Headlamps ...................................80
aiming ..................................82–83
autolamp system .......................80
bulb specifications ....................86
daytime running lights .............82
flash to pass ..............................81
high beam .................................81
replacing bulbs .........................87
turning on and off ....................80
Heating
heating and air conditioning
system ...........................68, 71, 74
Index
393
2010 Flex(471)
Owners Guide, 1st Printing
USA(fus)