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General E46 Forum
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Old 04-18-2013, 07:08 PM   #1
123Shift
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Another problem

My 01 325i with 47k miles started making a new noise this am. A low humming that is associated with the climate control. When the climate control is off there is no noise. It almost sounds like a low throaty exhaust but much quieter. The funny thing is it gets louder and faster with engine speed almost like engine noise being picked by a sound system. Any ideas? This seems like a wierd one to me because engine speed seems to affect it. Thanks!!!
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Old 04-19-2013, 08:05 PM   #2
123Shift
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Can't be that I've stumped all the brilliant minds on here. Someone must have a suggestion no?
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Old 04-19-2013, 08:07 PM   #3
wildirish317
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We're still trying to figure out how you have an '01 with only 47k miles. Give us a few days to get past that.
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Old 04-19-2013, 08:10 PM   #4
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When you mention climate control, the firs thing that comes to mind is the blower motor. Mine makes a very slight noise when it's below 30 degrees outside. We need more details. Does turning the air compressor on/off have any influence?
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Old 04-19-2013, 08:24 PM   #5
123Shift
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Ill try the compressor, adjusting the temp and fan speed. I guess I should have investigated further but thought it might be a common problem. I thought of the blower motor but couldn't think how the rpm's could affect that. Also the FSR is not perfect. I have the common fan speed variation for the first minute or so after start up, but this humming sound is new. Sounds almost like its coming from under the dash behind the steering wheel. I couldn't hear it in the engine compartment. The 47k thing is just luck. Craigslist find. Sat in a garage for most of its life. It only had 42 on it when I got it just before Christmas. I couldn't pass it up for 8 grand. Never pictured myself a BMW owner but I love it!! I'm hooked. Now I can honestly say I understand the ultimate driving machine thing. Next will be an M3 sedan if I can afford it.
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Old 04-19-2013, 08:28 PM   #6
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Sounds like you could have a dirty blower motor.
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Old 04-19-2013, 08:35 PM   #7
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Quote:
Originally Posted by 123Shift View Post
Ill try the compressor, adjusting the temp and fan speed. I guess I should have investigated further but thought it might be a common problem. I thought of the blower motor but couldn't think how the rpm's could affect that. Also the FSR is not perfect. I have the common fan speed variation for the first minute or so after start up, but this humming sound is new. Sounds almost like its coming from under the dash behind the steering wheel. I couldn't hear it in the engine compartment. The 47k thing is just luck. Craigslist find. Sat in a garage for most of its life. It only had 42 on it when I got it just before Christmas. I couldn't pass it up for 8 grand. Never pictured myself a BMW owner but I love it!! I'm hooked. Now I can honestly say I understand the ultimate driving machine thing. Next will be an M3 sedan if I can afford it.
Do some further investigation and maybe a post a video. I'm guessing because the car sat for extended periods you might run into a few issues like this. And it seems like you've caught the BMW bug!
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Old 04-19-2013, 08:36 PM   #8
wildirish317
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Never pictured myself a BMW owner but I love it!! I'm hooked. Now I can honestly say I understand the ultimate driving machine thing. Next will be an M3 sedan if I can afford it.
omg, you're hooked! Welcome to the club.

Variation with engine speed points to the compressor. I can hear my compressor when it engages, but really haven't given it much thought. With A/C, I figure it's a "run to failure" item. You could replace the compressor now, or wait until it fails. Either way, it's a high dollar option. A/C systems are not really a DIY endeavor, unless you have the proper equipment to evacuate and recharge the system, and know how to use it.
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Quote:
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I just don't know what I'd do with 560 hp that doesn't involve getting arrested.
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