Jeep Cherokee 2009 Operating Information Manual page 190

compartment. This is normally a result of mois-
ture from rain, snow, or high humidity accumu-
lating on the radiator and being vaporized
when the thermostat opens, allowing hot cool-
ant to enter the radiator.
If an examination of your 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 bottle.
• Check coolant freeze point in the radiator and
in the coolant recovery bottle. If coolant needs
to be added, contents of coolant recovery
bottle must also be protected against freezing.
• If frequent coolant additions are required, or if
the level in the coolant recovery bottle does not
drop when the engine cools, the cooling system
should be pressure tested for leaks.
• Maintain coolant concentration at 50% HOAT
engine coolant (minimum) and distilled water
for proper corrosion protection of your engine,
which contains aluminum components.
• Make sure that the radiator and coolant recov-
ery bottle 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, also.
• 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 cool-
ing performance, poor gas mileage, and in-
creased emissions.
Hoses and Vacuum/Vapor Harnesses
Inspect surfaces of hoses and nylon tubing for
evidence of heat and mechanical damage. Hard
or soft spots, brittle rubber, cracking, tears, cuts,
abrasions, and excessive swelling indicate dete-
rioration of the rubber.
Pay particular attention to those hoses nearest to
high heat sources such as the exhaust manifold.
Inspect hose routing to be sure hoses do not
touch any heat source or moving component that
may cause heat damage or mechanical wear.
Ensure the nylon tubing in these areas has not
melted or collapsed.
Inspect all hose connections such as clamps and
couplings to make sure they are secure and no
leaks are present.
Components should be replaced immediately if
there is any evidence of wear or damage that
could cause failure.
Fuel System
The Electronic Fuel Injection high-pressure fuel
system's tubes, special connectors, connections,
and clamps have unique material characteristics
that provide adequate sealing and resist attack by
deteriorated gasoline.
You are urged to use only the manufacture speci-
fied tubes, connections, and clamps, or their
equivalent in material and specification, in any
fuel system servicing.
Brake System
In order to assure brake system performance, all
brake system components should be inspected
periodically. Suggested service intervals can be
found in the "Maintenance Schedule" in Section 8
of this manual.
WARNING!
Riding the brakes can lead to brake failure and
possibly an accident. Driving with your foot rest-
ing or riding on the brake pedal can result in
abnormally high brake temperatures, excessive
lining wear, and possible brake damage. You
wouldn't have your full braking capacity in an
emergency.
Brake and Power Steering System Hoses
When servicing the vehicle for scheduled mainte-
nance, inspect the surface of the hoses and nylon
tubing for evidence of heat and mechanical dam-
age. Hard and brittle rubber, cracking, tears, cuts,
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