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2000 BMW 323i Question: Intermittent overheating & interior fan

 

Question

Jim Pa, Pasadena, CA, December 09, 2010, 14:01
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Intermittently the engine overheats and the cooling fan does not go on; thermostat has been replaced; is it the fan relay?
Interior fan at times goes on & off with no key in ignition

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  • Answer #1

    Chow December 14, 2010, 04:10
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     Master

    Replace fan speed resistor for the interior fan issue.
    Check the wiring and readings of the coolant sensor connected to the bottom radiator hose. Does the fan kick in when A/c is actuated? as this should be your stage 2, which is also your overheat stage.
    Check water pump. The impeller could be free spinning on the shaft

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    Visitor, December 14, 2010, 07:23

    The fan does not always kick in when the A/C is turned on. The mechanic that looked at it said it's the fan module; I will mention your suggestion.
    Thank you.

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