User Manual - Page 480

For 2019 Wrangler.

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478 SERVICING AND MAINTENANCE
Cooling System
Coolant Checks
Check the engine, battery (if equipped), intercooler (if
equippe
d), and Motor Generator Unit (MGU) (if equipped)
coolant (antifreeze) protection every 12
months (before the
onset o
f freezing weather, where applicable). If the engine,
battery (if equipped), intercooler (if equipped), and MGU (if
equipped) coolant (antifreeze) is dirty or rusty in appear
-
ance, the system should be drained, flushed and refilled with
f
resh O
AT coolant (conforming to MS.90032) by an autho-
rized dealer. Check the front of the A/C condenser (if
e
quippe
d) or radiator for any accumulation of bugs, leaves,
etc. If dirty, clean by gently spraying water from a garden
hose vertically down the face of the A/C condenser (if
equipped) or the back of the radiator core.
Check the engine, battery (if equipped), intercooler (if
equippe
d), and MGU (if equipped) cooling system hoses for
brittle rubber, cracking, tears, cuts, and tightness of the
connection at the coolant recovery bottle and radiator.
Inspect the entire system for leaks. DO NOT REMOVE THE
COOLANT PRESSURE CAP WHEN THE COOLING
SYSTEM IS HOT.
WARNING!
You or others can be badly burned by hot engine
coolant
(antifreeze) or steam from your radiator. If you
see or hear steam coming from under the hood, do not
open the hood until the radiator has had time to cool.
Never open a cooling system pressure cap when the
radiator or coolant bottle is hot.
Keep hands, tools, clothing, and jewelry away from the
radiat
or cooling fan when the hood is raised. The fan
starts automatically and may start at any time, whether
the engine is running or not.
When working near the radiator cooling fan, discon-
nect t
he fan motor lead or turn the ignition to the OFF
mode. Th
e fan is temperature controlled and can start at
any time the ignition is in the ON mode.
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