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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 06-29-2008, 07:25 AM   #1 (permalink)
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2000 323i weird air blowing fan from engine

I don't know why, but it seems like when the weather is hot, the car's power gets reduced, RPM goes higher than it needed to be, and the fan in front of the engine starts to run and make a huge air-blowing noise as I accelerate.
It happens very frequently... like everyday whenever the temperature outside is over 20 degrees celcius. I wonder if this is normal that every BMW owner experiences.
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Old 06-29-2008, 01:49 PM   #2 (permalink)
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if you run your car with your climate control on AUTO, then yes, on hotter days the fan operation will kick in and turn at a higher fan speed(also RPM). Add to that the operation of your auxiliary fan, so yes... you might feel that "extra" rush of air u speak of.

I do not know about "reduced power" on hotter days, because the ECU dictates the optimum temp at which an engine should run(around 180 degrees farenheit) and adjusts ur fan speed accordingly in order to maintain that temp

Then consider a given... the laws of physics tells us that heat(over and beyond that optimum temp) will result in loss of power.
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Old 06-29-2008, 05:57 PM   #3 (permalink)
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[QUOTE=secretstep;539227]I don't know why, but it seems like when the weather is hot, the car's power gets reduced, RPM goes higher than it needed to be, and the fan in front of the engine starts to run and make a huge air-blowing noise as I accelerate.
It happens very frequently... like everyday whenever the temperature outside is over 20 degrees celcius. I wonder if this is normal that every BMW owner experiences.[/QUOT
My does the same,I think it is normal,but do not know what cause it...
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Old 07-01-2008, 02:17 AM   #4 (permalink)
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wow, i didn't know that.
Can I turn that option (climate control) off? or will it affect the car in bad way?
It simply very annoys me.
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Old 07-01-2008, 09:25 AM   #5 (permalink)
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Try setting the climate control to a higher temp, using less A/C will make it run less.
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Old 07-01-2008, 10:32 AM   #6 (permalink)
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wow, i didn't know that.
Can I turn that option (climate control) off? or will it affect the car in bad way?
It simply very annoys me.
Of course you can turn climate control OFF. :-) or follow witeshark's advise...
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Old 07-20-2008, 11:05 PM   #7 (permalink)
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I have been having the same issue. "Loud Air sound" I just bought a 99 323i and noticed it for the past 2 weeks...What i have found out is it does come from the cooling fans . It gets loud on my car after about 15 -20 min driving with the AC turned on on hot days. So I started leaving the AC off and I rarely hear it now.

The sound come on after I come to a stop then starts for a few seconds then go's away when the car gets above 35 to 40 mph. Does yours do this too?????
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Old 07-20-2008, 11:46 PM   #8 (permalink)
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Originally Posted by RMB_BMW323i View Post
I have been having the same issue. "Loud Air sound" I just bought a 99 323i and noticed it for the past 2 weeks...What i have found out is it does come from the cooling fans . It gets loud on my car after about 15 -20 min driving with the AC turned on on hot days. So I started leaving the AC off and I rarely hear it now.

The sound come on after I come to a stop then starts for a few seconds then go's away when the car gets above 35 to 40 mph. Does yours do this too?????
My exactly does the same,no worries!
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Old 07-20-2008, 11:58 PM   #9 (permalink)
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Originally Posted by RMB_BMW323i View Post
I have been having the same issue. "Loud Air sound" I just bought a 99 323i and noticed it for the past 2 weeks...What i have found out is it does come from the cooling fans . It gets loud on my car after about 15 -20 min driving with the AC turned on on hot days. So I started leaving the AC off and I rarely hear it now.

The sound come on after I come to a stop then starts for a few seconds then go's away when the car gets above 35 to 40 mph. Does yours do this too?????
i believe what you are hearing is the auxiliary fan stepping up it's RPM's to cope with the increased load of your engine. It's all computer controlled based the engine temperature, so as ZIBBY sez: "no worries" ;-)

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Old 07-21-2008, 12:09 AM   #10 (permalink)
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Thanks guys....for the info.....
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