I already did look at my last information

100Hz

What previous question are you answering?

Look guys, I am not a BMW expert, nor an electronics expert. So if it is possible, kindly provide some less cryptic information.

What is that 100Hz thing?

What I am trying to figure right now is, if it is possible that the mechanic who worked on my front suspension has somehow, somewhere, disconnected that thin wire, and my fan is not receiving a signal to start turning. Since I've verified that the fan receives 13.x Volts, the only thing that can prevent it from turning (I think) is the signal from the DME.

And yes, when I tried the fan, the car was hot (normal operating temperature) and I had switched the air con on, to full blast.

Thank you for any help you can provide.

John
Don't start a sentence when seeking help with "look guys"

Te speed of the signal does not change it comes from the DME or DDE whichever the case and has a frequency of 100Hz

So you need to be able to measure the frequency or put an oscilloscope on it.

Pity you are not in Australia because there is a man in Melbourne who is really knowledgable on this

I think it was well deserved and understated.

When you first start your X the ECM activates the electric aux fan for a short period regardless of engine temp, until diagnostics are complete and it shuts it off. The fan runs at a very low speed but it runs. The air conditioning does not necessarily trigger the fan to run. Even if it does it is not immediately after you turn on the AC.

If the fan does not come on, check the 50 amp fuse and check to see if it turns freely.

Do you,
last post I make arsehole

If the 50A fuse was blown, would the thick wire going to the fan carry 14V? I guess that precludes the fuse as the reason for the failure.

I'll have my son fire up the car, while I'll be watching the fan and get back to you.

As you understand, I try to be sure that it is the fan that is bad, before I come up with 500$ that the parts guy wants for it, in Ukraine (I don't even want to think of what BMW Greece would want for the fan)

Just a generalized opinion based on previous posts. I didn't single you out you just did that on your own.:goodluck:

I certainly endorse wanting to be sure before buying parts 100%.

I think the voltage check eliminates the fuse. I always check for voltage then pull the fuse to see if there is still voltage--don't look for logic. It always makes me feel like I won't be back checking for some reason I find out later.

You got a point there! You never know with those "smart" cars anymore!