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Hot day today - aux fan kicked in when engine off

Discuss your latest mods or ideas, and anything to do with the BMW X5 (E53).
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CaseyJay
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Hot day today - aux fan kicked in when engine off

Post by CaseyJay » Sat Jul 09, 2016 8:13 pm

Temp near 30C round my way today, parked up, shut down as normal, nothing running. car left in full sunshine. 3 hours later my wife says something's odd with the car - I can see/hear the Aux fan running. By the time I get the keys to move it into the shade, fan has stopped.

As the fan in question is for HVAC I cannot imagine why this would be a normal event with ignition off for so long so suspect a fault.  Have heard of the FSR causing fan problems - do they cook and throw a wobbly? Only replaced mine late last year but you never know...

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X5Sport
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Re: Hot day today - aux fan kicked in when engine off

Post by X5Sport » Sun Jul 10, 2016 12:00 pm

Could be the FSR is going again.  It does happen.
:ant: Never anthropomorphise computers. They hate that.

CaseyJay
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Re: Hot day today - aux fan kicked in when engine off

Post by CaseyJay » Wed Jul 13, 2016 3:23 pm

thanks, switched it out for a branded part, crossing fingers and no change.  Logic had it FSR should be ok as blower was good in all settings.

I am getting 5v to the compressor, aux fan works when tested with INPA, when I unplug the pressure sensor clutch kicks in for 2-3 secs then stops.

So I am guessing switch, refrigerant levels or evap sensor, or even control unit are preventing compressor running...???

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