Toyota
Jeep Cherokee
 Service Manual
Cooling system » Diagnosis and testing
Coolant-low level aeration

If the coolant level in radiator drops below top of radiator core tubes, air will enter cooling system.

Low coolant level can cause thermostat pellet to be suspended in air instead of coolant. This will cause thermostat to open later, which in turn causes higher coolant temperature. Air trapped in cooling system also reduces amount of coolant circulating in heater core resulting in low heat output.

    More about «Diagnosis and testing»:

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    Cooling system-testing for leaks

    Viscous fan drive

    Electric cooling fan

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    Radiator cap-pressure testing

    Coolant-low level aeration

    Deaeration

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