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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-03-2011, 11:17 PM   #1
Carlova78
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Clutch Fan is loud!

We got a 2001 325i that sounds like a 16-wheeler in low gears.(automatic)
My old nissan use to sound like this too because the fan was too tight?

Is this normal?
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Old 06-03-2011, 11:23 PM   #2
//TRD power
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Yes.
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Old 06-04-2011, 12:29 AM   #3
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It's the aux fan right behind the bumper.
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Old 06-04-2011, 07:38 AM   #4
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man its annoying lol. i thought the car was lagging since i couldnt even hear the engine rev.
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Old 06-04-2011, 09:10 AM   #5
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That's why I swapped to an electric fan. Noise gone, drag on engine gone, easier to take out the fan and the car is more responsive.
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Old 06-04-2011, 12:25 PM   #6
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the aux fan is the clutch fan correct? what type of elec fan do you have
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Old 06-08-2011, 03:02 PM   #7
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I have a 330i that's the same... the fan is loud as hell, even just at idle in park. Same problem? A recommendation for an electric replacement fan would be awesome.
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Old 06-08-2011, 03:36 PM   #8
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I have a 330i that's the same... the fan is loud as hell, even just at idle in park. Same problem? A recommendation for an electric replacement fan would be awesome.
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the aux fan is the clutch fan correct? what type of elec fan do you have
I had the aux fan (behind the bumper, front of radiator) that makes the truck sound.

Then you have the mechanical fan which is on the water pump. That one is known to fails and the blades blow up.

What I did is I bought a new Behr OEM electric fan, took the other two fans out and this one slides in right on the radiator between the engine.

Now the truck sound is gone, no worrying about the fan blades exploding and breaking stuff (happened twice to me, second time dented my hood and broke my radiator) and it's much much much easier to slide out to work on the engine.

Search "kpeng electric fan" and you will find it.
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Old 06-08-2011, 03:49 PM   #9
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Quote:
Originally Posted by Solidjake View Post
I had the aux fan (behind the bumper, front of radiator) that makes the truck sound.

Then you have the mechanical fan which is on the water pump. That one is known to fails and the blades blow up.

What I did is I bought a new Behr OEM electric fan, took the other two fans out and this one slides in right on the radiator between the engine.

Now the truck sound is gone, no worrying about the fan blades exploding and breaking stuff (happened twice to me, second time dented my hood and broke my radiator) and it's much much much easier to slide out to work on the engine.

Search "kpeng electric fan" and you will find it.
Wouldn't removal of the auxiliary fan that sits in front of the A/C condenser negatively impact the cooling of the A/C system, especially at idle?
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Old 06-08-2011, 03:50 PM   #10
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Then why do manual cars not overheat?
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Old 06-08-2011, 04:01 PM   #11
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Then why do manual cars not overheat?
My question has nothing to do with overheating. You mentioned that you removed not only the mechanical fan/fan clutch attached to the water pump, but also the electric auxiliary fan that sits in front of the A/C condenser. As you know, that fan turns on when you turn on the A/C. It's function is to push air through the A/C condenser coils, helping to cool the refrigerant in the system and in turn allowing the A/C system to blow colder air at idle and lower road speeds.

When the auxiliary fan fails, the first thing you notice is less cooling capability from the A/C while at idle or at slow speeds. At highway speeds, the air is naturally forced through the condenser allowing the system to cool properly.

I understand that manual transmission cars don't have the mechanical fan/fan clutch, but all E46's have the electric auxiliary fan for proper A/C function.
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Old 06-08-2011, 04:04 PM   #12
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No, manual cars have only ONE fan which is the electric one behind the radiator, the auto's have the mechanical fan and the aux fan. I don't see the manual cars having problems, or if they do it's the same thing as automatic cars with both fans.
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Old 06-08-2011, 04:36 PM   #13
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No, manual cars have only ONE fan which is the electric one behind the radiator, the auto's have the mechanical fan and the aux fan. I don't see the manual cars having problems, or if they do it's the same thing as automatic cars with both fans.
Although I knew about the mechanical fan only on automatic equipped cars, I was just under the impression that all E46's still had the auxiliary, or pusher, fan installed. This is my 4th E46 I have owned, but the first three were bought new and were always under warranty so I never really noticed the fan configuration. By looking at the previously mentioned electric fan thread, I see that it is of sufficient size to pull enough air through the condenser and the radiator. Thanks for the clarification-I still learn something new everyday!
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Old 06-08-2011, 04:38 PM   #14
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Glad you learned something.

Although I have seen a few manual/SMG M3's with the two fan setup for some reason.
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Old 06-08-2011, 06:25 PM   #15
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my manual 530i has a clutch fan? i think
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Old 06-08-2011, 06:54 PM   #16
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Originally Posted by Solidjake View Post
I had the aux fan (behind the bumper, front of radiator) that makes the truck sound.

Then you have the mechanical fan which is on the water pump. That one is known to fails and the blades blow up.

What I did is I bought a new Behr OEM electric fan, took the other two fans out and this one slides in right on the radiator between the engine.

Now the truck sound is gone, no worrying about the fan blades exploding and breaking stuff (happened twice to me, second time dented my hood and broke my radiator) and it's much much much easier to slide out to work on the engine.

Search "kpeng electric fan" and you will find it.
I'm sorry mate but I am 100% positive that the clutch fan is responsible for the "truck" sound. I know, I have one too, even if my car is a manual.
It goes on at startup for 30 seconds to 1 minute, then keeps quiet until temp in engine bay rises, then... truck sound.
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Old 06-08-2011, 06:57 PM   #17
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Nope, the fan clutch on the mechanical fan prevents it from rotating more than 3000 RPM, if not it will break. That's why a clutch that fails allows the fan assembly to rotate the same speed as the engine/water pump
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Old 06-09-2011, 03:32 AM   #18
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My question has nothing to do with overheating. You mentioned that you removed not only the mechanical fan/fan clutch attached to the water pump, but also the electric auxiliary fan that sits in front of the A/C condenser. As you know, that fan turns on when you turn on the A/C. It's function is to push air through the A/C condenser coils, helping to cool the refrigerant in the system and in turn allowing the A/C system to blow colder air at idle and lower road speeds.

When the auxiliary fan fails, the first thing you notice is less cooling capability from the A/C while at idle or at slow speeds. At highway speeds, the air is naturally forced through the condenser allowing the system to cool properly.

I understand that manual transmission cars don't have the mechanical fan/fan clutch, but all E46's have the electric auxiliary fan for proper A/C function.
For this very reason, I opted to NOT go with the oem electric puller fan. Instead, I kept my aux pusher fan and deleted my clutch fan using a Spal 16inch puller 2360CFM model. With a few modifications I was able to reuse the stock shroud which kept it pretty much stock looking. I believe manual e46's came with only one puller and it cools just fine. Here in Phoenix it gets to 110+ normally and with my current setup, the a/c blows frost bite cold very quick. The stock clutch fan took much longer to get the a/c cold and never got it as cold. I could only imagine how much worst it would be if I removed the a/c aux fan relying on a single puller behind the radiator.
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Old 06-09-2011, 07:06 AM   #19
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i want to swap mine to electrical also..
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Old 06-09-2011, 09:49 AM   #20
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i want to swap mine to electrical also..
There is a great DIY out there on how to do it. You just order the single part number (fan). Remove a few parts, install new fan. Very simple. I did it, and even with it ~100 here lately, I havn't had any problems.
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