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E39 Auxiliary Fan issue

BMW forum 5 series car: E12, E28, E34, E39, E60, E61, F07, F10, F11

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E39 Auxiliary Fan issue

Postby karl39 » Thu, 29 Apr 2010 13:13:30 UTC

Hi guys i am new to the site, so if you can forgive me for maybe repeating the issue in question. I have looked on the forums, but no joy.

I have a 523i, 2000, automatic.

My issue started with car overheating last October.

I checked my viscus fan, and it was not locking, so i had it changed. Then I had a hear line crack on my radiator so i had it changed as well.

I noticed that my auxiliary fan was not kicking in any more. After taking it to my local garage, guy in there suggested that fan is probably fine , just the fact that it was a cold winter, fan would not come on till there is a need to support the viscus. I tried with aircon on , still not coming on. Then when i took it back to him to change a thermostat as a possible problem elimination attempt, he was about to show me how to do it , since is very easy, he said. As he took the electrical component that clips on to the thermostat ,just at the bottom of the radiator, auxiliary fan came on, as thermostat was disconnected . Is this normal?

That's when I was completely baffled. He suggested that when temperatures in the summer get higher that fan would kick in. I am sure that before, fan used to come in even when it was not that summer heat .

Now after few days in their 20C,and loads stationary traffic, fan is still not coming on.

I tried turning AC on after car is heated up, still not on. Checked the fuses as well..

Now I know that fan and its motor are working. I have thermostat or relays (that work with the fan ) as possible options left. If you guys have any suggestions or experiences , or even a solution , please help.

Regards, Karl
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Postby minesavolvo » Thu, 29 Apr 2010 14:04:30 UTC

Do you mean this fan - Clicky

AFAIK it should come on from time to time when the air conditioner demands it.

Try turning your AC on and put the temperature down to minimum and see what happens.
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Postby pb2301 » Thu, 29 Apr 2010 16:02:20 UTC

I think I'd find a different mechanic.

The auxillary fan assists the air con. The viscous fan assists the cooling system.

I can't understand why the fan would kick in when you take off the thermostat though.

Might be an idea to find a local BMW indie.

HTH
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Postby karl39 » Thu, 29 Apr 2010 16:06:19 UTC

Thanks on your reply. Yes that is the fan. And i tried to do as you suggested, no joy. I know for a fact that it used to come on before. What was very strange was when my mechanic had thermostat disconnected and fan came on. Still wonder if anyone had that experience , is it standard?

From what i have found by looking on the internet, i have thermostat and fan relay's left. By the way car is not overheating at the moment. I am only concerned that AC compressor might suffer some damage if the fan is meant to come on.
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Postby karl39 » Thu, 29 Apr 2010 16:14:18 UTC

Fan didn't come on when thermostat was taken off, it was just the lead that is attached to it. I will have to probably look for new mechanic. Plus i meant resistor not relay in my last post.

Karl
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Postby stevecvo » Thu, 29 Apr 2010 17:57:17 UTC

I don't know about 2000 but for my 2001 525d there was a factory recall to check and if necessary replace the auxiliary fan. Mine was replaced under this procedure.
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Postby karl39 » Thu, 29 Apr 2010 21:03:40 UTC

I will look into the recall issue, thanks. I don't have much more than that left to go buy.
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Re: E39 Auxiliary Fan issue

Postby Fil3332 » Tue, 10 Jul 2012 11:25:08 UTC

Hi Stevecvo , how did you find out about your warranty ? thanks
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Re: E39 Auxiliary Fan issue

Postby stevecvo » Tue, 10 Jul 2012 14:04:30 UTC

Not quite sure what you mean. I took my car into my local dealer in the UK for a service while it was under warranty and the dealer pointed out the fan issue to me. This was back in 2001 or 2002
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Re: E39 Auxiliary Fan issue

Postby Fil3332 » Mon, 16 Jul 2012 19:30:55 UTC

hi , i went to dealer and unfortunately they told me i had no recalls on my car thanks anyway
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Re: E39 Auxiliary Fan issue

Postby minesavolvo » Mon, 16 Jul 2012 19:46:10 UTC

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Re: E39 Auxiliary Fan issue

Postby Fil3332 » Wed, 13 Feb 2013 14:40:56 UTC

Great link thanks minesavolvo :)
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