E39 sounds like jet aircraft

Hi All,
A couple of days ago my yr 2000 528iA Sport started running with a very noisy fan all the time. It starts about 30 seconds after the engine is started (no matter whether warm or cold) and runs until you
switch it off again.
A couple of months ago I needed a new radiator and the garage told me the thermostat needed changing as well (aparently that was leaking too...) - Is this noisy and perstistant fan a thousand or so miles after this work was done a conincidence? If not anybody got any other ideas?
Cheers
Ralph
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Sounds like the secondary air pump, possibly a lose hose. Happened to me.

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Dunno - the fan on the front of the RAD is spinning and the noise seems to be eminating from there. Also when you switch off the engine you can hear the noise winding down...difficult to express text form however!

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snipped-for-privacy@googlemail.com wrote:

Ralph,
That fan (auxiliary fan) runs whenever the AC is switched on, and in response to a thermostatic element in the engine cooling system. It's possible your thermostatic element (2 level switch) is kaput (German tech term for passed-on, dead, nailed to the perch..) and signaling that full fan is needed all the time. That would be my guess. When it's switched on with the AC, it isn't on full speed.. full speed only comes on in response to the thermo-switch.
A new thermo switch will probably fix it right up.
Oh - it sounds like a jet engine on full speed.. it's quite a fan actually.
Very very unlikely - the secondary air pump ONLY runs for about 20 seconds on cold startup with the temps below some point.. it doesn't run all the time.
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Thanks - I'll see how much the servcie dept want to change that...which in the same month as 4 new Michelins on the 18" parallels was something that I was hoping to avoid by blaming the last lot for breaking it...
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On 16 Mar, 12:09, snipped-for-privacy@googlemail.com wrote:

Just by way of a followup the dealer diagnosed a new fan unit at a staggering 187 + 210 to fit it. I explained that I couldn't really justify 400 to fix something that worked too well and got them to unplug it. Does anybody have any ideas how to fix this cheaply, or am I going to be spending the summer watching the temprature guage...
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On Mar 26, 1:45 pm, snipped-for-privacy@googlemail.com wrote:

Well that quote probably equates to a 30 (non-BMW) part and an hour's labour ;-)
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Er! 187 for what exactly ---- labour in a BMW dealer = 100 hour A 10 relay 40 BMW relay The A/C auxiliary fan in front of the Rad = 200 and that is Massive so a small fan as used on something like a computer Graphics card that usually coast 3.00 at a computer fair will be priced @ 30+
Sir Hugh of Bognor
The difference between men and boys is the price of their toys. Intelligence is not knowing the answer but knowing where and how to find it!
Hugh Gundersen snipped-for-privacy@h-gee.co.uk Bognor Regis, W.Sussex, England, UK
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Browse the Unix nerds site - John Burns... if no-one pops up here soon with the likely problems / answer
and / or find a good specialist - in your area - there's a list on John Burns site...
Nick
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