Jeep WRANGLER 2020 Owner's Manual page 527

Engine Coolant Checks
Check the engine coolant (antifreeze)
protection every 12 months (before the onset of
freezing weather, where applicable). If the
engine coolant is dirty, the system should be
drained, flushed, and refilled with fresh Organic
Additive Technology (OAT) coolant (conforming
to MS.90032) by an authorized dealer. Check
the front of the A/C condenser 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.
NOTE:
If the engine coolant protection is changed, you
must also adjust the coolant protection for the
Battery/Electrical systems Ú page 65.
Check the engine 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.
Cooling System — Drain, Flush And Refill
NOTE:
Some vehicles require special tools to add
coolant properly. Failure to fill these systems
properly could lead to severe internal engine or
electrical system damage. If the system
requires the addition of any coolant, please
contact an authorized dealer.
If the engine coolant (antifreeze) is dirty or
contains visible sediment, have an authorized
dealer clean and flush with Organic Additive
Technology (OAT) coolant (conforming to
MS.90032).
For the proper maintenance intervals
Ú page 57.
Electric/Battery Coolant System
These coolant systems must be serviced by an
authorized dealer. If the coolant level is below
what is specified on the reservoir, contact an
authorized dealer for service.
These systems require the use of high purity
water, such as deionized, or distilled water,
when mixing the water and coolant (antifreeze)
solution. The use of lower quality water will
reduce the amount of corrosion protection in
SERVICING AND MAINTENANCE
the cooling systems. If the coolant level of the
battery coolant system is low, the wrench
warning light will be illuminated on the
instrument cluster.
Selection Of Coolant
For fluid selection Ú page 79.
NOTE:
Mixing of engine coolant (antifreeze) other

than specified Organic Additive Technology
(OAT) engine coolant, may result in engine
damage and may decrease corrosion protec-
tion. OAT engine coolant is different and
should not be mixed with Hybrid Organic
Additive Technology (HOAT) engine coolant or
any "globally compatible" coolant. If a
non-OAT engine coolant 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.90032), by an authorized dealer as soon
as possible.
Do not use water alone or alcohol-based

engine coolant products. Do not use addi-
tional rust inhibitors or antirust products, as
they may not be compatible with the radiator
engine coolant and may plug the radiator.
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