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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 08-14-2011, 12:08 AM   #221
new//M3fan
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Behr unit is plug and play as well. I don't see how it can't be if it's the same part.

Both Bosch and Behr are OEM units. Make sure to get one of these two, not other companies like Hamburg-Tecnik, etc.

i bought a Hamburg-Tecnik unit. So far so good.
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Old 08-14-2011, 10:38 AM   #222
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Hey Ken nice info, Thanks! You should make a DIY thread with step by step info with photos and have it locked.
I did it already with the help of Nervous....


http://e46fanatics.com/forum/showthr...735&highlight=
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Old 08-14-2011, 11:43 AM   #223
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Sweet! Nice write up, Thanks!
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Old 08-14-2011, 12:14 PM   #224
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You're welcome. It's rather easy to do. Good time to clean up anything behind the bumper, etc.
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Old 08-26-2011, 11:49 PM   #225
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Thanks so much for this... Happy to be rid of the sucking city bus sound!
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Old 08-29-2011, 10:13 AM   #226
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Thanks so much for this... Happy to be rid of the sucking city bus sound!
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Old 08-29-2011, 10:23 AM   #227
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I literally had a long dream that I did this mod on my car. SolidJake was in the dream helping me DIY it but it was one of those epic dreams where you a trying to do something but never can seem to get it done.

It was weird!
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Old 08-29-2011, 12:32 PM   #228
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I literally had a long dream that I did this mod on my car. SolidJake was in the dream helping me DIY it but it was one of those epic dreams where you a trying to do something but never can seem to get it done.

It was weird!


Maybe you couldn't finish because it was really a vision to the future. Since you hadn't actually done this swap before you couldn't perceive the outcome of the install. Maybe Jake had the same dream
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Old 08-29-2011, 02:49 PM   #229
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Ok, I gotta ask...what is this bus sound you guys are talking about? I'm not hearing it
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Old 08-30-2011, 04:54 PM   #230
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The sound a mechanical clutch fan makes when fully engaged. It sounds like a freakin semi-truck at a green light.
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Old 08-30-2011, 05:03 PM   #231
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Did this mod over the weekend. Definitely not going back to the stock setup. Thanks kpeng!
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Old 08-31-2011, 10:28 AM   #232
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Did this mod over the weekend. Definitely not going back to the stock setup. Thanks kpeng!
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Old 09-29-2011, 12:24 AM   #233
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I'm next Kpeng! Doing this next month after my coolant maintenance service this Friday. When I do the fan I will upgrade to a Stewart Water Pump for good measure.
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Old 09-29-2011, 12:38 AM   #234
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I also want to do this mod. I'm tired of my fan sounding like a jet engine. I'm gonna use it as time to also do my belt tensioner. Not sure if the problem is just the belt needing to be replaced or if its the entire hydraulic mechanism, but it squeals every now and then on a cold start, but its always random. I've never done any kind of mechanical work on my car before, but the fan doesn't seem that difficult.
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Old 10-20-2011, 08:52 PM   #235
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Ok, just a couple of thoughts here. I was chatting with Olaf today & told him that my weird noise/vibration @ 2k to 3k rpm has been solved. I had to submit & take it to an x-bmw tech to help me on this one. It was the exhaust manifold heat shield blowing in the wind from the mechanical fan!

On the flip side of that, when a mechanical clutch is fully engaged, that's when it should be silent.

So, putting these two thoughts together, are you really sure the sounds are coming from you fan clutch, or could something be blowing / rattleing around you engine compartment?

Just wondering.
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Old 10-20-2011, 10:57 PM   #236
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On the flip side of that, when a mechanical clutch is fully engaged, that's when it should be silent.
How do you figure? When the clutch fan is fully engaged, it is moving at roughly the same speed as the crank and pulling a massive amount of air through the radiator. This is the bus noise everyone refers to...
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Old 10-23-2011, 12:07 AM   #237
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How do you figure? When the clutch fan is fully engaged, it is moving at roughly the same speed as the crank and pulling a massive amount of air through the radiator. This is the bus noise everyone refers to...
Hi, I was refering to teh comment in post #230 "The sound a mechanical clutch fan makes when fully engaged."

The clutch should be silent. I agree that the fan / air turbulence will be loud.

I think the electric fan is quieter due to the improved fan blade design, not because it's electric.
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Old 10-23-2011, 02:32 PM   #238
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I also want to do this mod. I'm tired of my fan sounding like a jet engine. I'm gonna use it as time to also do my belt tensioner. Not sure if the problem is just the belt needing to be replaced or if its the entire hydraulic mechanism, but it squeals every now and then on a cold start, but its always random. I've never done any kind of mechanical work on my car before, but the fan doesn't seem that difficult.
This is the secondary air pump you are hearing. It sounds exactly like a jet engine and it can get really loud when it is about to fail. It also sits on rubber mounts that could go bad and break over time (like it has done in my car) and cause the pump to shake and vibrate thus making the sound louder.

It could be an issue that your pump is staying on longer than it should if you are hearing it all the time. The pump on/off function, I believe, is regulated by the engine temperature, O2 sensors, and current emission output.

That said the pulleys will rattle and squeak (like a very dry sound) when old.

Belts as far as I can tell don't make much noise when they are old.

Fan clutches I cant say but I think the little Aux fan does get annoyingly loud and heavy sounding (like a UPS truck) when it needs to be replaced.
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Old 10-23-2011, 02:35 PM   #239
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Steve, just do the swap already. Take my word for it....
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Old 10-23-2011, 02:36 PM   #240
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Ok, just a couple of thoughts here. I was chatting with Olaf today & told him that my weird noise/vibration @ 2k to 3k rpm has been solved.
Just wondering.
Steve,
Do you still consider the fan swap after reading thru all these pages? Let me know because I may be road tripping it out to Ontario soon and would bring one up for you.
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