Jeep Wrangler Owner's Manual page 261

Adding Engine Coolant
Your vehicle has been built with an improved
engine coolant (antifreeze) that allows ex-
tended maintenance intervals. This engine
coolant (antifreeze) can be used up to 5 Years
or 105,000 miles (168 000 km) before replace-
ment. To prevent reducing this extended main-
tenance period, it is important that you use the
same engine coolant (antifreeze) throughout
the life of your vehicle. Please review these
recommendations for using Hybrid Organic
Additive Technology (HOAT) engine coolant
(antifreeze).
When adding engine coolant (antifreeze):
• The
manufacturer recommends
MOPAR Antifreeze/Coolant
Year/100,000 Mile Formula HOAT (Hybrid
Organic Additive Technology) or equivalent.
• Mix a minimum solution of 50% HOAT engine
coolant (antifreeze) and distilled water. Use
higher concentrations (not to exceed 70%) if
temperatures below -34°F (-37°C) are antici-
pated.
• Use only high purity water such as distilled
or deionized water when mixing the water/
engine coolant (antifreeze) solution. The use
of lower quality water will reduce the amount
of corrosion protection in the engine cooling
system.
Please note that it is the owner's responsibility
to maintain the proper level of protection
against freezing according to the temperatures
occurring in the area where the vehicle is
operated.
NOTE:
Mixing engine coolant (antifreeze) types will
decrease the life of the engine coolant (an-
tifreeze) and will require more frequent en-
gine coolant (antifreeze) changes.
using
Cooling System Pressure Cap
5
The cap must be fully tightened to prevent loss
of engine coolant (antifreeze), and to ensure
that engine coolant (antifreeze) will return to the
radiator from the coolant reserve tank.
The cap should be inspected and cleaned if
there is any accumulation of foreign material on
the sealing surfaces.
WARNING!
The warning words DO NOT OPEN HOT on
the cooling system pressure cap are a safety
precaution. Never add engine coolant (anti-
freeze) when the engine is overheated. Do not
loosen or remove the cap to cool an over-
heated engine. Heat causes pressure to build
up in the cooling system. To prevent scalding
or injury, do not remove the pressure cap
while the system is hot or under pressure.
Disposal of Used Engine Coolant
Used ethylene glycol based engine coolant
(antifreeze) is a regulated substance requiring
proper disposal. Check with your local authori-
ties to determine the disposal rules for your
community. To prevent ingestion by animals or
children, do not store ethylene glycol based
engine coolant (antifreeze) in open containers
or allow it to remain in puddles on the ground.
If ingested by a child or pet, seek emergency
assistance immediately. Clean up any ground
spills immediately.
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