Jeep Grand Cherokee User Manual page 106

Cooling System
WARNING!
You or others can be badly burned by hot coolant
or steam from your radiator. If you see or hear
steam coming from under the hood, do not open
the hood until the radiator has had time to cool.
Never try to open a cooling system pressure cap
when the radiator or coolant bottle is hot.
Coolant Checks
Check coolant protection every 12 months (before
the onset of freezing weather, where applicable).
If coolant is dirty or rusty in appearance, the
system should be drained, flushed, and refilled
with fresh coolant.
Check the front of the radiator for any accumula-
tion of bugs, leaves, etc. Clean the radiator by
gently spraying water from a garden hose at the
back of the core.
Check the engine cooling system hoses for con-
dition and tightness of connection. Inspect the
entire system for leaks. Any hoses that show cuts
or severe abrasion must be replaced.
Cooling System — Drain, Flush, and Refill
At the intervals shown in the appropriate "Mainte-
nance Schedule," the system should be drained,
flushed, and refilled.
104
If the solution is dirty and contains a considerable
amount of sediment, clean and flush with reliable
cooling system cleaner. Follow with a thorough
rinsing to remove all deposits and chemicals.
Selection of Coolant
Use only the manufacturer's recommended cool-
ant, refer to Recommended Fluids, Lubricants,
and Genuine Parts for correct coolant type.
CAUTION!
Mixing of coolants other than the specified
HOAT coolant may result in decreased corro-
sion protection and engine damage that may not
be covered under the new vehicle warranty. If a
non-HOAT coolant is introduced into the cooling
system in an emergency, it should be replaced
with the specified coolant as soon as possible.
Do not use plain water alone or alcohol base
antifreeze products. Do not use additional rust
inhibitors or antirust products, as they may not
be compatible with the radiator coolant and may
plug the radiator.
This vehicle has not been designed for use with
Propylene Glycol based coolants. Use of Propy-
lene Glycol base coolants is not recommended.
Adding Coolant
When adding coolant, a minimum solution of 50%
recommended HOAT ethylene glycol coolant in
water should be used. Use higher concentrations
(not to exceed 70%) if temperatures below -38°C
(-37°F) are anticipated.
Use only high purity water such as distilled or
deionized water when mixing the water/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.
Coolant Pressure Cap
The cap must be fully tightened to prevent loss of
coolant, and to ensure that coolant 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.