Home > Technical (L322) > ECU? Fan running constantly - behind offside headlight |
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Joe90 Member Since: 29 Apr 2010 Location: Hampshire Posts: 6408 |
It is the fan in the big black box full of ECUs. This is a known problem well covered on the forum in the past. Search is your friend .
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9th Dec 2015 9:47pm |
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rrsimon Member Since: 03 Oct 2015 Location: Hitchin Posts: 45 |
Blank. |
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9th Dec 2015 10:05pm |
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SMUTT Member Since: 30 Jun 2014 Location: Cheshire Posts: 459 |
Does your car go to sleep.
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9th Dec 2015 11:27pm |
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Cam-Tech-Craig Member Since: 03 Aug 2011 Location: Gloucestershire Posts: 16281 |
First try a battery reset sir... Cures all number of issues |
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9th Dec 2015 11:29pm |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
I think that I might know the cause
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9th Dec 2015 11:32pm |
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Cam-Tech-Craig Member Since: 03 Aug 2011 Location: Gloucestershire Posts: 16281 |
Good call Miggit |
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9th Dec 2015 11:38pm |
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SMUTT Member Since: 30 Jun 2014 Location: Cheshire Posts: 459 |
@miggit - well I never knew that - useful info thanks.
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9th Dec 2015 11:47pm |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
Err, Not only is it a 2 wire jobbie, but it is also threaded, like a water one on the head, and then just poked in to a plastic clip Not very custom fit but on the up side it's obviously cheap and nasty so they can't over charge Yesterday I couldn't spell Engineer... Today I are one!
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10th Dec 2015 12:00am |
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rrsimon Member Since: 03 Oct 2015 Location: Hitchin Posts: 45 |
Blank. |
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10th Dec 2015 7:57am |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
The fan defiantly runs when the key is out, but as the ECU's go to sleep I can't see the temp going up, but, I would not recommend running the car without the fan, god knows that the ECU's are temperamental enough, without overheating them....... that could be a very costly mistake Yesterday I couldn't spell Engineer... Today I are one!
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10th Dec 2015 9:11am |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
Just had a look at the wiring, the fan is powered directly from the sensor, which is in turn powered directly from the BCU, from what I can see there is no fuse between the components, so the easy kill is out of the question. Looking at the way it is wired the only thing that can cause the fan to run constantly is the temperature sensor, it must have failed in the "on" position. I will have a dig around and see if I can find the temp range that it operates within, there is a good chance that an after market one will do the job
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10th Dec 2015 9:18am |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
while these are common s/h there aren't any mainstream outlets selling them
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10th Dec 2015 10:02am |
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rrsimon Member Since: 03 Oct 2015 Location: Hitchin Posts: 45 |
Blank |
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10th Dec 2015 11:27am |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
Yesterday I couldn't spell Engineer... Today I are one!
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10th Dec 2015 11:49am |
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