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Lexus RX300 Engine >> OVERHEATING OF ENGINES WITH ELECTRIC COOLING FANS

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    Overheating Of Engines With Electric Cooling Fans

    Ever since gasoline prices have shot up, vehicle manufacturers have downsized cars and their engines. One of the best ways of making a car smaller is to turn the engine sideways under the hood. This has instituted the use of one or more electric cooling fans to move air through the radiator. Diagnosing overheating conditions on engines with electric cooling fans requires a few extra steps to ensure that the electrical control system for the fan is operating properly.

    o Perform all of the tests associated with normal
    installations, for example: check antifreeze level,
    thermostat, water pump and hoses.

    o Check that the cooling fan is moving air through the
    radiator. With the fan turned on air should never blow out
    through the front of the vehicle. If there is more than one
    fan, be sure to check both. It's possible for the
    electrical leads to be reversed during installation causing
    the fan to move air in the opposite direction.

    o If the vehicle is equipped with two fans, be sure that both
    of them work. If the vehicle is equipped with air
    conditioning, one of the fans may only operate when the air
    conditioning is on. Consult the service manual if you are
    not sure.

    o Fans are controlled by a temperature sending unit. Check a
    suspected faulty sensor by bridging the two connections. If
    the fan comes on, then the sensor is at fault.

    o Verify that the fan comes on at the temperature listed in
    the service manual. Replace the sensor if the proper
    temperatures are not maintained.

    For additional information see AERA Technical Bulletins: TB 706,
    SB 158 & SB 137

    The AERA Technical Committee
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