engine JEEP WRANGLER 4XE JL 2021 Owner's Manual
Page 395 of 471
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Do not open hot engine cooling system. Never
add engine coolant (antifreezeyf Z K H Q W K H
engine is overheated. Do not loosen or
remove the cap to cool an overheated engine.
Heat causes pressure to build up in the
cooling system. To prevent scalding or injury,
do not remove the pressure cap while the
system is hot or under pressure.
Do not use a pressure cap other than the one
specified for your vehicle. Personal injury or
engine damage may result.
Page 396 of 471
: $ 5 1 , 1 *
Do not open hot engine cooling system. Never
add engine coolant (antifreezeyf Z K H Q W K H
engine is overheated. Do not loosen or
remove the cap to cool an overheated engine.
Heat causes pressure to build up in the
cooling system. To prevent scalding or injury,
do not remove the pressure cap while the
system is hot or under pressure.
Do not use a pressure cap other than the one
specified for your vehicle. Personal injury or
engine damage may result.
8
22_JL_OM_EN_USC_t.book Page 395
Page 397 of 471
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5 L G L Q J W K H E U D N H V F D Q O H D G W R E U D N H I D L O X U H D Q G
S R V V L E O \ D F R O O L V L R Q ' U L Y L Q J Z L W K \ R X U I R R W U H V W L Q J
R U U L G L Q J R Q W K H E U D N H S H G D O F D Q U H V X O W L Q
D E Q R U P D O O \ K L J K E U D N H W H P S H U D W X U H V H [ F H V V L Y H
O L Q L Q J Z H D U D Q G S R V V L E O H E U D N H G D P D J H < R X
Z R X O G Q R W K D Y H \ R X U I X O O E U D N L Q J F D S D F L W \ L Q D Q
H P H U J H Q F \
: $ 5 1 , 1 *
Use only the manufacturer recommended
brake fluid Úpage 452. Using the wrong type
of brake fluid can severely damage your brake
system and/or impair its performance. The
proper type of brake fluid for your vehicle is
also identified on the original factory installed
hydraulic master cylinder reservoir.
To avoid contamination from foreign matter or
moisture, use only new brake fluid or fluid that
has been in a tightly closed container. Keep
the master cylinder reservoir cap secured at
all times. Brake fluid in an open container
absorbs moisture from the air resulting in a
lower boiling point. This may cause it to boil
unexpectedly during hard or prolonged
braking, resulting in sudden brake failure. This
could result in a collision.
Overfilling the brake fluid reservoir can result
in spilling brake fluid on hot engine parts,
causing the brake fluid to catch fire. Brake
fluid can also damage painted and vinyl
surfaces, care should be taken to avoid its
contact with these surfaces.
Page 400 of 471
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When replacing a blown fuse, always use an
appropriate replacement fuse with the same
amp rating as the original fuse. Never replace
a fuse with another fuse of higher amp rating.
The use of a fuse with a rating other than indi-
cated may result in a dangerous electrical
system overload. If a properly rated fuse
continues to blow, it indicates a problem in the
circuit that must be corrected. Never replace a
blown fuse with metal wires or any other mate -
rial. Failure to use proper fuses may result in
serious personal injury, fire and/or property
damage.
Before replacing a fuse, make sure that the
ignition is off and that all the other services
are switched off and/or disengaged.
If the replaced fuse blows again, contact an
authorized dealer.
If a general protection fuse for safety systems
(air bag system, braking systemyf S R Z H U X Q L W
systems (engine system, gearbox systemyf R U
steering system blows, contact an authorized
dealer.
1 — Fuse Element
2 — Blade Fuse with a good/functional
fuse element
3 — Blade fuse with a bad/not functional
fuse element (blown fuseyf
CAUTION!
When installing the power distribution center
cover, it is important to ensure the cover is
properly positioned and fully latched. Failure to
do so may allow water to get into the power
distribution center and possibly result in an
electrical system failure.
8
22_JL_OM_EN_USC_t.book Page 399
Page 447 of 471
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' R Q R W X V H D O F R K R O R U J D V R O L Q H D V D I X H O E O H Q G L Q J
D J H Q W 7 K H \ F D Q E H X Q V W D E O H X Q G H U F H U W D L Q
F R Q G L W L R Q V D Q G K D ] D U G R X V R U H [ S O R V L Y H Z K H Q
P L [ H G Z L W K G L H V H O I X H O
& $ 8 7 , 2 1
, I W K H : D W H U L Q ) X H O , Q G L F D W R U / L J K W U H P D L Q V R Q
' 2 1 2 7 6 7 $ 5 7 H Q J L Q H E H I R U H \ R X G U D L Q W K H Z D W H U
I U R P W K H I X H O I L O W H U V \f W R D Y R L G H Q J L Q H G D P D J H
Úpage 383.
CAUTION!
Failure to comply with Oil Change requirements
for vehicles operating on biodiesel blends
between 6yb D Q G \b (B6–B20yf Z L O O U H V X O W L Q
premature engine wear. Such wear is not
covered by the New Vehicle Limited Warranty.
CAUTION!
Use of blends greater than 20yb L V Q R W D S S U R Y H G
Use of blends greater than 20yb F D Q U H V X O W L Q
engine damage. Such damage is not covered by
the New Vehicle Limited Warranty.
Page 451 of 471
& $ 8 7 , 2 1
Mixing of engine coolant (antifreezeyf R W K H U W K D Q V S H F L I L H G 2 U J D Q L F $ G G L W L Y H 7 H F K Q R O R J \ 2 $ 7 \f engine coolant (antifreezeyf P D \ U H V X O W L Q H Q J L Q H G D P D J H D Q G
may decrease corrosion protection. Organic Additive Technology (OATyf H Q J L Q H F R R O D Q W L V G L I I H U H Q W D Q G V K R X O G Q R W E H P L [ H G Z L W K + \ E U L G 2 U J D Q L F $ G G L W L Y H
Technology (HOATyf H Q J L Q H F R R O D Q W D Q W L I U H H ] H \f or any “globally compatible” coolant (antifreezeyf , I D Q R Q 2 $ 7 H Q J L Q H F R R O D Q W D Q W L I U H H ] H \f is introduced into
the cooling system in an emergency, the cooling system will need to be drained, flushed, and refilled with fresh OAT coolant (conforming to MS.90032yf E \
an authorized dealer as soon as possible.
Do not use water alone or alcohol-based engine coolant (antifreezeyf S U R G X F W V ' R Q R W X V H D G G L W L R Q D O U X V W L Q K L E L W R U V R U D Q W L U X V W S U R G X F W V D V W K H \ P D \ Q R W E H
compatible with the radiator engine coolant and may plug the radiator.
This vehicle has not been designed for use with propylene glycol-based engine coolant (antifreezeyf 8 V H R I S U R S \ O H Q H J O \ F R O E D V H G H Q J L Q H F R R O D Q W D Q W i-
freezeyf L V Q R W U H F R P P H Q G H G .