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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 08-11-2005, 02:02 PM   #1 (permalink)
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Hi all.

I wanted to get some opinions. My 01 325i is making a loud roaring noise (like a large fan) when I go from a stop to about 5-10 mph. It then goes away. This seems new and seems to be getting louder. I'm a second owner so i've just started noticing it over the last 4-5 months. Is my transmission or radiator fan about to go? or is this sound normal?
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Old 08-11-2005, 02:38 PM   #2 (permalink)
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Quote:
Originally posted by kbrandt@Aug 11 2005, 02:02 PM
Hi all.

I wanted to get some opinions. My 01 325i is making a loud roaring noise (like a large fan) when I go from a stop to about 5-10 mph. It then goes away. This seems new and seems to be getting louder. I'm a second owner so i've just started noticing it over the last 4-5 months. Is my transmission or radiator fan about to go? or is this sound normal?
[snapback]369003[/snapback]
I noticed the same thing on my car, but it happens when engine is very hot , like in "stop and go" traffic.I think it is normal, once sombody told me that is aux air pump and it kicks in for a moment as the engine is hot to reduce harmful staff in exhaust fumes, but again I am not sure about this theory.
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Old 08-17-2005, 04:52 PM   #3 (permalink)
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Originally posted by zibby+Aug 11 2005, 01:38 PM--><div class='quotetop'>QUOTE(zibby @ Aug 11 2005, 01:38 PM)</div><div class='quotemain'><!--QuoteBegin-kbrandt@Aug 11 2005, 02:02 PM
Hi all.

I wanted to get some opinions. My 01 325i is making a loud roaring noise (like a large fan) when I go from a stop to about 5-10 mph. It then goes away. This seems new and seems to be getting louder. I'm a second owner so i've just started noticing it over the last 4-5 months. Is my transmission or radiator fan about to go? or is this sound normal?
[snapback]369003[/snapback]
I noticed the same thing on my car, but it happens when engine is very hot , like in "stop and go" traffic.I think it is normal, once sombody told me that is aux air pump and it kicks in for a moment as the engine is hot to reduce harmful staff in exhaust fumes, but again I am not sure about this theory.
,
[snapback]369012[/snapback]
[/b][/quote]
That seems to describe the same thing I experience. It appears to be only happening in stop and go traffic. I live in the south so heat would make sense. Plus the timing of when I started noticing it.

Thanks for the response.
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Old 08-18-2005, 10:37 PM   #4 (permalink)
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It does it too mine to, when it's very humid, so it seems normal
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