BMW E46 318i M43 1.9 Petrol - The water cooler fan does not work

I have a problem that the radiator fan does not work for me.
I tried to close the contacts from the temperature sensor and ignition but it does not turn on.
I hooked up the second fan which is supposedly working and does not work.
There are 3 pins on the radiator plug. On one of the thicker ones is 12V on the second mass and on the third it is 4.2V.

When shorting the temperature sensor on this third cable, 4.2V voltage does not change, and probably should be because it is this wire that controls the fan speed.

I have already replaced the climate control panel because it is said he is responsible for controlling the fan. But without changes, the fan still does not turn.
Anyone have any ideas what it can be?
If it was a fuse, would it not be any tension?

Is the voltage on the 4.2V control cable and the fan should turn?

Radiator plug? Do you mean this on the passenger side? There is more control module (regulating the speed) of the fan there. Mass supply and 4.5V power supply is control. The sensor will be on the engine and short circuit will not give much. More measurement whether alone as a sensor did not get a short circuit or quite a break.

I will add that you can have both fans broken. Connect both to the power supply either from the battery or even (more safely) the 9V battery for a moment literally and will be known.

I mean this plug on the passenger side of the windmill.
I have read that if you plug the connector from the temperature sensor at the bottom of the radiator, also on the passenger side, the fan should work. (Because this sensor turns on the fan)
This plug from sensor No. 11 - coolant temperature sensor


The fan connect 12V to what is 12V, mass to ground
and 12V or 9V on the control to give?

Because he has to go through the module to check the operation of the module. I've read that the control is somehow differently implemented but I do not understand how.

Your ideas are sucking, the only thing that can be controlled from the computer, digital control so in the barn you can not take this cable.


Where are you from where you are from?

I'm from Zielona Góra.

Well, I read something that some other control is. I have a computer cable only I need to install INPEA and there is some option of firing a windmill.
Will the voltage on the control cable change as the fan turns on? Will this meter not work and will be 4.2V all the time

There is a digital signal there, not measurable by a multimeter.

Added after 40 [seconds]:

The easiest way is to replace the windmill or diagnose inpa or other crap.

Added after 1 [minutes]:

Secondly, after switching on the air conditioning, the fan should start.

When the engine is switched off and the ignition key is turned on after turning on the fan, the fan does not work.

leszeklk2 wrote:

With the engine switched off

Then why do not you turn on the engine for the air-conditioning to work?

Inpa will say something is wrong with the sensor. The fact that now it will be a souvenir after unbuttoning it but you can then see if the reading from it is close to the truth.

It does not hurt, however, to check the fan itself, and the fact that someone gave a good fit is also nothing reliable.

Only how to check the fan itself, how the control signal is digital and I do not have anyone with such a car?

I will not start the car for now because I have a slightly undressed engine, I replace the timing cover seals. But should the fan not walk on the engine off, the ignition and air conditioning on?

leszeklk2 wrote:

I will not start the car for now because I have a slightly undressed engine

If you finish the engine, you will take care of the fan.

Strumien swiadomosci swia wrote:

leszeklk2 wrote:

I will not start the car for now because I have a slightly undressed engine

If you finish the engine, you will take care of the fan.

Only that it can be checked without a fired engine, does the fan work on the key in the ignition position or a completely exclusive car? Can anyone confirm this? Because I would like to have eliminated this problem faster because it should probably take less time.

And the fan I bought from the auction where they wrote that before the shipment they check the windmills on a special table. I wrote to them later if they definitely checked and they said yes.

And is it possible that if there is little air conditioning factor, then the fan does not work? Because I've had strange air conditioning noise before. But it would probably be a bit senseless?

Start with a computer diagnostics, even INPA can be. If you fan the fan error and you can delete it or return it right away, you have it damaged. Check only by activating with a computer or turn on the engine on the engine, otherwise it does not make sense.
90% of cases of fan failure, and such good ones, I have almost every one used at a good price. Let's not kid ourselves but it's already old cars and the same parts of them will be

Problem solved. The fan himself was found guilty and it was filled with oil. The fan module was functional.