Cooling System Pressure Cap; Do not open hot engine cooling system. Never add; engine coolant (antifreeze) when the engine is over-- Page 392

2018 Jeep Wrangler JK Owner Manual

Table of Contents

GETTING TO KNOW YOUR VEHICLE
GETTING TO KNOW YOUR INSTRUMENT PANEL
SAFETY
OCCUPANT RESTRAINT SYSTEMS
STARTING AND OPERATING
SERVICING AND MAINTENANCE
MULTIMEDIA
UCONNECT PHONE — IF EQUIPPED
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Mix a minimum solution of 50% OAT engine coolant

that meets the requirements of FCA Material Standard

MS.90032 and distilled water. Use higher concentrations

(not to exceed 70%) if temperatures below −34°F (−37°C)

are anticipated. Please contact an authorized dealer for

assistance.

Use only high purity water such as distilled or deionized

water when mixing the water/engine coolant (anti-

freeze) solution. The use of lower quality water will

reduce the amount of corrosion protection in the engine

cooling system.

NOTE:

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.

Some vehicles require special tools to add coolant prop-

erly. Failure to fill these systems properly could lead to

severe internal engine damage. If any coolant is needed

to be added to the system, please contact a local autho-

rized dealer.

Mixing engine coolant (antifreeze) types is not recom-

mended and can result in cooling system damage. If HOAT

and OAT coolant are mixed in an emergency, have a

authorized dealer drain, flush, and refill with OAT coolant

(conforming to MS.90032) as soon as possible.

Cooling System Pressure Cap

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

expansion bottle/recovery tank if so equipped.
The cap should be inspected and cleaned if there is any

accumulation of foreign material on the sealing surfaces.

WARNING!

Do not open hot engine cooling system. Never add
engine coolant (antifreeze) when the engine is over-
heated. Do not loosen or remove the cap to cool an
overheated 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.

Do not use a pressure cap other than the one speci-
fied for your vehicle. Personal injury or engine
damage may result.

390

SERVICING AND MAINTENANCE

Detailed Information for 2018 Jeep Wrangler JK Owner Manual

Lists of information found in 2018 Jeep Wrangler JK Owner Manual - Page 392

  • Mix a minimum solution of 50% OAT engine coolant that meets the requirements of FCA Material Standard MS.
  • Use only high purity water such as distilled or deionized water when mixing the water/engine coolant (anti- freeze) solution.
  • 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.
  • Some vehicles require special tools to add coolant prop- erly.
  • Mixing engine coolant (antifreeze) types is not recom- mended and can result in cooling system damage.
  • Do not open hot engine cooling system.
  • Do not use a pressure cap other than the one speci- fied for your vehicle.

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