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General E46 Forum
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Old 10-04-2012, 09:23 PM   #1
always-there
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Fan clutch.

Hey guys. So I just replaced my fan clutch because there was this (18 wheeler fan noise ) going on, and after I starting noticing the same sound, but louder. I'm hoping it's only because it's new/breaking in. Any ideas? I've read a couple of threads so far, but none that directly answer the question towards a solution. E46mango..DMAX, help?
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Old 10-04-2012, 09:24 PM   #2
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what is the condition of the water pump bearing?
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Old 10-04-2012, 09:25 PM   #3
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Replacing the clutch.
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Old 10-04-2012, 09:27 PM   #4
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Installing new fan clutch.
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Old 10-04-2012, 09:28 PM   #5
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Originally Posted by UDM-E46 Enthusiast View Post
Hey guys. So I just replaced my fan clutch because there was this (18 wheeler fan noise ) going on, and after I starting noticing the same sound, but louder. I'm hoping it's only because it's new/breaking in. Any ideas? I've read a couple of threads so far, but none that directly answer the question towards a solution. E46mango..DMAX, help?
The fan clutch almost never makes noise. I'd say it never makes noise, but surely somebody would call me out. I can't tell you what the noise is, but it isn't the fan clutch.
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Old 10-04-2012, 09:29 PM   #6
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Replacing the clutch.
Yes, I understand that. But the clutch fan is attached to the water pump. If the bearing is bad then that can explain the 18 wheel fan noise you are referring to. Also why not convert to electric fan since you are already in for a 100 bucks for the clutch and another 100 would get you a electric fan. In the long run you save money and not have to worry about the exploding fan impeller and the clutch.

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Old 10-04-2012, 09:29 PM   #7
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I know Behr's not the best brand, but eh. Out with the old and in with the new.
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Old 10-04-2012, 09:31 PM   #8
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I didn't check the water pump bearing. I kinda' figured the fan clutch was the problem.
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Old 10-04-2012, 10:00 PM   #9
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Personal experience or guess, Jay? Just want to make sure before I go digging into that. I appreciate the input!
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Old 10-04-2012, 10:45 PM   #10
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A 1 minute vid of the said noises would help to isolate the problem(s) parts

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Old 10-04-2012, 11:39 PM   #11
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Thanks Bimmersgarage, but it's all good now. It just needed to break in I guess, it went away. : )
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Old 10-05-2012, 07:08 AM   #12
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Old 10-05-2012, 07:54 AM   #13
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Well it is normal for your fan to make that noise. On cold start, for about 20-30 seconds, and anytime under hood temperature rises high enough to engage the clutch.

Sorry if this post doesn't make sense. I am writing on a cell phone.
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Old 10-06-2012, 01:35 PM   #14
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Loud fan noise came back, any idea guys ? Dang it.
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Old 10-06-2012, 03:14 PM   #15
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Take the belt off and run the car for a couple of minutes. Do not allow it to overheat, but without the belt you will know if the noise comes from the belt/pulley system, or something else.

The fan clutch is almost never the source of noise of any kind. Noises from the area will come from the waterpump, the idler and tensioner pulleys, and the power steering pump and alternator.

When you start the car on a cold engine, there is a very loud fan that pushes fresh air into the exhaust stream to help the CATs do what CATs do but don't do very well while cold. After the CATs heat up, the fan turns off and stays off until the next Cold Engine Start. If you hear a loud fan on the first start of the day, or the first start after a long period of being parked, then the noise is 1.) normal, and 2.) costly to fix, and 3.) completely unimportant to the car so you can wait for failure of the fan -- which will be noted by the Check Engine light and a code (P1423, or something like that). You can wait for the Secondary Air Pump to completely fail and the car won't care one bit. The Smog Shop guy will care, but the car won't.

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Old 10-06-2012, 03:38 PM   #16
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The sound is only produced when I take off around 3-4k rpm's. As Jay mentioned, it might be the water pump wearing out. Maybe the bearing's really worn out causing the fan to turn at higher revolutions. If that's the case then I'll have to replace it. But for now I'm waiting for the struts to come In so I can fix that problem too.
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Old 10-06-2012, 07:27 PM   #17
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Found the problem. It turned out to be the water pump, thanks Jay. Buying pump right now.
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Old 10-12-2012, 07:00 PM   #18
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I just replaced the water pump and after I got done temp gauge went straight through the roof! Why?
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Old 10-12-2012, 07:01 PM   #19
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Any ideas guys? Did I not purge the air out correctly ? I did do that!
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Old 10-12-2012, 07:10 PM   #20
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You didn't correctly bleed the cooling system. Search for the threads here on how to properly bleed. Did mine last weekend with the proper procedure and the temperature went and stayed right at 12 O Clock.
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