Intervention Regeneration Strategy - Message Process Flow; Diesel Exhaust Fluid; Cooling System - Jeep Grand Cherokee 2018 Manual

Intervention Regeneration Strategy
— Message Process Flow
This engine meets all required diesel engine
emissions standards. To achieve these emis-
sions standards, your vehicle is equipped with a
state-of-the-art engine and exhaust system.
These systems are seamlessly integrated into
your vehicle and managed by the Powertrain
Control Module (PCM). The PCM manages en-
gine combustion to allow the exhaust system's
catalyst to trap and burn Particulate Matter (PM)
pollutants, with no input or interaction on your
part.
Additionally, your vehicle has the ability to alert
you to additional maintenance required on your
vehicle or engine.
Refer to "Instrument Cluster Display" in "Getting
To Know Your Instrument Panel" for further
information.
WARNING!
A hot exhaust system can start a fire if you
park over materials that can burn. Such
materials might be grass or leaves coming
into contact with your exhaust system. Do not
park or operate your vehicle in areas where
your exhaust system can contact anything
that can burn.

Diesel Exhaust Fluid

Diesel Exhaust Fluid (DEF) sometimes known
simply by the name of its active component,
UREA—is a key component of selective cata-
lytic reduction (SCR) systems, which help diesel
vehicles meet stringent emission regulations.
DEF is a liquid reducing agent that reacts with
engine exhaust in the presence of a catalyst to
convert smog-forming nitrogen oxides (NOx)
into harmless nitrogen and water vapor.
Refer to "Fluids And Lubricants" in "Technical
Specifications" for further information.

Cooling System

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 pres-
sure cap when the radiator or coolant bottle
is hot.
• Keep hands, tools, clothing, and jewelry
away from the radiator cooling fan when
the hood is raised. The fan starts automati-
cally and may start at any time, whether the
engine is running or not.
WARNING! (Continued)
• When working near the radiator cooling
fan, disconnect the fan motor lead or turn
the ignition to the OFF mode. The fan is
temperature controlled and can start at any
time the ignition is in the ON mode.
Engine Coolant Checks
Check the engine coolant (antifreeze) protection
every 12 months (before the onset of freezing
weather, where applicable). If the engine cool-
ant (antifreeze) is dirty, the system should be
drained, flushed, and refilled with fresh OAT
coolant (conforming to MS.90032) by an autho-
rized dealer. Check the front of the A/C con-
denser for any accumulation of bugs, leaves,
etc. If dirty, clean by gently spraying water from
a garden hose vertically down the face of the
condenser.
Check the engine cooling system hoses for
brittle rubber, cracking, tears, cuts, and tight-
ness 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 SYS-
TEM IS HOT.
(Continued)
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