2020 JEEP WRANGLER User Manual

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SERVICING AND MAINTENANCE 255

 Mix a minimum solution of 50% OAT engine coolant

that meets the requirements of FCA Material Standard

MS.90032 and distilled water. Use higher concentra-

tions (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

properly. 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 authorized 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.

Disposal Of Used Coolant

Used ethylene glycol-based coolant (antifreeze) is a

regulated substance requiring proper disposal. Check with

your local authorities to determine the disposal rules for

your community. To prevent ingestion by animals or

children, do not store ethylene glycol-based coolant 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.

Coolant Level

The coolant bottle provides a quick visual method for

determining that the coolant level is adequate. With the

engine OFF and cold, the level of the engine coolant

(antifreeze) in the bottle should be between the ranges

indicated on the bottle.

The radiator normally remains completely full, so there is

no need to remove the radiator/coolant pressure cap

unless checking for engine coolant (antifreeze) freeze

point or replacing coolant. Advise your service attendant

of this. As long as the engine operating temperature is

satisfactory, the coolant bottle need only be checked once

a month.

When additional engine coolant (antifreeze) is needed to

maintain the proper level, only OAT coolant that meets the

requirements of FCA Material Standard MS.90032 should

be added to the coolant bottle. Do not overfill.

Engine Coolant Level — 2.0L

With the engine OFF and cold, the level of the engine

coolant should be within the OK range between the ADD

and FULL range on the dipstick.

1. Remove the cap with level dipstick from the engine

coolant bottle.

2. Clean off the coolant from the dipstick.

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.