Jeep WRANGLER 4Xe 2022 Manual page 68

66 SERVICING AND MAINTENANCE
Cooling System Notes
NOTE:
When the vehicle is stopped after a few
miles/kilometers of operation, you may observe
vapor coming from the front of the engine
compartment. This is normally a result of moisture
from rain, snow, or high humidity accumulating on
the radiator and being vaporized when the ther-
mostat opens, allowing hot engine coolant (anti-
freeze) to enter the radiator.
If an examination of the engine compartment
shows no evidence of radiator or hose leaks, the
vehicle may be safely driven. The vapor will soon
dissipate.
Do not overfill the coolant expansion bottle.

Check the coolant freeze point in the radiator

and in the coolant expansion bottle. If engine
coolant needs to be added, the contents of the
coolant expansion bottle must also be protected
against freezing.
If frequent engine coolant additions are

required, the cooling system should be pressure
tested for leaks.
Maintain coolant concentration at a minimum of

50% OAT coolant (conforming to MS.90032)
and deionized, or distilled water.
Use only high purity water such as deionized, or

distilled water when mixing the water/coolant
solution for the engine, battery or high voltage
electronics cooling systems. The use of lower
quality water will reduce the amount of corro-
sion protection in the cooling system.
Make sure that the coolant expansion bottle

overflow hoses are not kinked or obstructed.
Keep the front of the radiator clean. If your

vehicle is equipped with air conditioning, keep
the front of the condenser clean.
Do not change the thermostat for Summer or

Winter operation. If replacement is ever neces-
sary, install ONLY the correct type thermostat.
Other designs may result in unsatisfactory
factory engine cooling performance, poor gas
mileage, and increased emissions.
The coolant freeze point in the battery and

power electronics loop should be checked by an
authorized dealer as a special tool is required to
remove the cap from those expansion bottles.
Electric/Battery coolant system 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 solution. The use
of lower quality water will reduce the amount of
corrosion protection in the cooling systems.