Question about Peugeot 405

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Overheating Despite everything done the car ovrheats in town. The fan and switch and everything works fine when testing, but when the girl drives in town the temp rises until the alarm sounds, but the fan does not start auto. Is the little black box to be blamed? 2002 Peugeot 206 (1.4)

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  • smirfy May 12, 2009

    Sorry, but it is the temp switch in the radiator. When the temp goes high, it closes and pass power to the fan.

  • Samuel Charles Spriggs May 11, 2010

    Then I would check the fan relay. It should be somewhere in the circuit the radiator heat switch wire is in.



    It should be clicking when the temp gets high enough -- does it?

  • Samuel Charles Spriggs May 11, 2010

    Sounds like the fan relay.



    "The fan and switch and everything works fine when testing,"



    What switch is this?

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Sounds like the temperature thermostat is stuck closed. It is usually located at the top front of the engine in the small manifold that the radiator pipe connects to.You can test it on the stove - they open widely above 90 degrees C

Posted on May 12, 2009

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Some time in the past the fan was damaged in a minor fender bender. This resuted in the fan turning a bit more difficult than normal. This caused a bit more current being drawn and resulted in the thermal overload fitted in the speed resistor to go open circuit, thus breaking the normal operation path for the fan to run when heating should start the fan. This speed resistor is by-passed when the A/C is switched on, result = the fan operates normally.

Posted on May 12, 2009

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