Jeep WRANGLER 2023 Manual page 69

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
Electric/Battery Coolant systems Ú page 67.
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 any coolant is needed to be
added to the system please contact an authorized
dealer.
If the engine coolant (antifreeze) is dirty or
contains visible sediment, have an authorized
dealer clean and flush with OAT coolant
(conforming to MS.90032).
For proper maintenance intervals Ú page 61.
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 the cooling
systems. If the coolant level of the battery coolant
system is low, the Hybrid Electric Vehicle System
Service Light will be illuminated on the instrument
cluster.
SERVICING AND MAINTENANCE
Selection Of Coolant
For further information Ú page 83.
NOTE:
Mixing of engine coolant (antifreeze) other than

specified Organic Additive Technology (OAT)
engine coolant, may result in engine damage
and may decrease corrosion protection. OAT
engine coolant is different and should not be
mixed with Hybrid Organic Additive Technology
(HOAT) engine coolant or any "globally compat-
ible" coolant. If a non-OAT engine coolant is
introduced into the cooling system in an emer-
gency, the cooling system will need to be
drained, flushed, and refilled with fresh OAT
coolant (conforming to MS.90032), by an autho-
rized dealer as soon as possible.
Do not use water alone or alcohol-based engine

coolant products. Do not use additional 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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