Fan running after switching off - battery draining

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My Name: Ozvtr

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Model: C3 2002-2005, Original shape model
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P0102 is related to the mass airflow sensor and i not related to the radiator fan.

Disconnect the grey connector and see if the fan still runs after the engine is switched off. If it does it's the fan speed controller assembly.
Disconnecting the large black connector will cut power to the fan at any time. A work-around for the time being might be to disconnect the power from the fan unit OVERNIGHT.
As I see it you have 2 choices:
1) there IS a cut our relay and it's faulty.
2) the fan speed controller is faulty.
Either way I cant see how the fault is anywhere other than in the fan shroud assembly.
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My Name: Ozvtr

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This is a duplicate of your post over in the diesel area.
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My Name: Missing Lincs

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Ozvtr wrote: ↑Tue Apr 27, 2021 8:49 amThis is a duplicate of your post over in the diesel area.
Topics now merged :D
If at first you don't succeed, destroy all the evidence and pretend you never tried :lol:
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My Name: Lazar_Dunjic

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Model: C3 2002-2005, Original shape model
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Regards, I took out the gray jack and the fan no spins, does that mean I have to take a set of new fans
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My Name: Ozvtr

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Lazar_Dunjic wrote: ↑Tue Apr 27, 2021 9:20 am Regards, I took out the gray jack and the fan no spins, does that mean I have to take a set of new fans
I think that it might.

Does the fan stay off when the the engine is running? Or does the fan do this whether the engine is running or not?
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My Name: Lazar_Dunjic

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the fan does not run while the engine is running, but when I turn it off it starts
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My Name: Ozvtr

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Disconnect the green sensor connector on the thermostat housing where the top radiator hose meets the engine, while the engine is running.
Does the fan run full speed? Re-connect the connector.

Pull fuse F8 in the engine bay fuse box while the engine is off.
Do the fans stop?
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My Name: Lazar_Dunjic

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Model: C3 2002-2005, Original shape model
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i took out the fuse and nothing happens, when i take out the green connector the fan is running at full speed
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My Name: C3driver52

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Ozvtr wrote: ↑Tue Apr 27, 2021 8:41 am P0102 is related to the mass airflow sensor
All of the 16v 1.4 Delphi ones do that. Doesn't seem to affect anything :lol:
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My Name: Ozvtr

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Joined: Wed Jul 10, 2019 3:31 am
Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Petrol
Mileage: 80000
Trim Level: Other
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Engine name: TU3 (75 PS)
Location: Brisbane, Australia.
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Lazar_Dunjic wrote: ↑Tue Apr 27, 2021 11:35 am i took out the fuse and nothing happens,
With the engine off the fans still run every 15 seconds? fuse F8 should supply power to the fan enable circuit. The fan should stop coming on.
Lazar_Dunjic wrote: ↑Tue Apr 27, 2021 11:35 am when i take out the green connector the fan is running at full speed
That tells me that the fan controller is still working. So that's good and disconnecting the grey plug stops the fans malfunctioning. So it looks like the fan assembly is OK.

I think there is something wrong with your BSM, the engine bay fuse box. I think it is supplying power to the grey wire of the fan controller when the engine is off. This enables the fan controller and with no input from the engine ECU (the engine is off) the fan will run because there is no 12V at the mauve wire.
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