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Old 09-05-2011, 12:20 AM   #1
mcguiver7
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new fan clutch but still have truck noise

2000 323i w/ 110k miles

My problem is I just replaced the fan clutch with a brand new one (MTC) from ecs tuning. It stays locked at start up even when the engine is cool and continues to stay locked regardless of temp or rpm. Any ideas as to why a brand new fan clutch would constantly engage?

The domino effect started with me changing the coolant (used bmw coolant). Expansion tank cracked a week later (older style) and replaced with the newer style (red bobber stick). Then the water pump bearings went and I replaced that. Then the fan clutch was constantly engaged. So I replaced the fan clutch with a brand new one (MTC) from ecs tuning. Also noticed the lower intake boot elbow had a few large cracks (but oddly no lean engine codes) so that also got replaced.

Completely off topic, but also wanted to mention i'm on my third front driver window regulator. Last one I bought from ecs tuning lasted 3 months. The rear driver side regulator just went out for the 3rd time as well. both passengers have gone out at least once. Tracks have all been greased. The door ajar function in the door lock module on both front doors have failed. Cam sensor failure around 60k. This evening the oil light came on at start up for a brief second. 5 bucks says that sensor is bad.

I think my 87 325is (295k miles on the odom) was more reliable than this car. Venting complete............
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Old 09-05-2011, 02:57 AM   #2
Shmo
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Quote:
Originally Posted by mcguiver7 View Post
2000 323i w/ 110k miles

My problem is I just replaced the fan clutch with a brand new one (MTC) from ecs tuning. It stays locked at start up even when the engine is cool and continues to stay locked regardless of temp or rpm. Any ideas as to why a brand new fan clutch would constantly engage?

The domino effect started with me changing the coolant (used bmw coolant). Expansion tank cracked a week later (older style) and replaced with the newer style (red bobber stick). Then the water pump bearings went and I replaced that. Then the fan clutch was constantly engaged. So I replaced the fan clutch with a brand new one (MTC) from ecs tuning. Also noticed the lower intake boot elbow had a few large cracks (but oddly no lean engine codes) so that also got replaced.

Completely off topic, but also wanted to mention i'm on my third front driver window regulator. Last one I bought from ecs tuning lasted 3 months. The rear driver side regulator just went out for the 3rd time as well. both passengers have gone out at least once. Tracks have all been greased. The door ajar function in the door lock module on both front doors have failed. Cam sensor failure around 60k. This evening the oil light came on at start up for a brief second. 5 bucks says that sensor is bad.

I think my 87 325is (295k miles on the odom) was more reliable than this car. Venting complete............
If you want the truck/bus sound gone you need to do the electrical fan swap
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You did pray to your BMW shrine first, asking the Great Roundel for guidance on parts' choices first, right?
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Old 09-05-2011, 09:05 AM   #3
mcguiver7
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Originally Posted by Shmo View Post
If you want the truck/bus sound gone you need to do the electrical fan swap
I read up on it, but i'm having a hard time justifying the costs when a fan clutch is $65-165. I was just hoping maybe there is some sort of break in period. Doesn't make sense that initially the noise wasn't there. Maybe the MTC fan clutch is junk?
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Old 09-05-2011, 09:25 AM   #4
avglushk
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Truck noise is always there. U probably just didnt pay that much attention to it. In winter time it's hard to hear it but in summer time it's always there. U need to do electrical fan swap like Shmo said. Hope that helps.
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Old 09-05-2011, 09:53 AM   #5
iansanderson
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you need to return the MTC part and buy an OEM part or at the very least, a BEHR part.

The new fan clutch is defective.
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Cheat Sheet:

GT1/ISIS/MoDiC = Factory authorized diagnostic system used by BMW dealerships across the world.

NCS Expert = BMW Factory R&D programming tool available on the internet (not intended for the public and not available to the dealership network)

OEM = Genuine BMW part only available from a franchised BMW dealership.

DME = Engine Management Computer
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Old 09-05-2011, 11:20 AM   #6
Shmo
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Originally Posted by iansanderson View Post
you need to return the MTC part and buy an OEM part or at the very least, a BEHR part.

The new fan clutch is defective.
The electric Behr fan is $184 right now
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Old 09-05-2011, 11:27 AM   #7
Solidjake
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+1 on getting a Behr or Sachs clutch, but.... I would just double the price, do the swap and sell the aux fan and the other parts. THE best thing I ever did to the car.
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Youtube - Electric Fan Swap - Projector Retrofit - Bulb Guide - NY to LA cross country
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Old 09-05-2011, 01:51 PM   #8
mcguiver7
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Originally Posted by Shmo View Post
The electric Behr fan is $184 right now
And that's for everything plug and play? Can you tell me who's selling it for that much? Considering the mechanical oem is 165, i'd spend $20 more for the electric.
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Old 09-05-2011, 01:55 PM   #9
Solidjake
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Here is my DIY

http://e46fanatics.com/forum/showthr...735&highlight=


Here is the part: 17117561757

http://cgi.ebay.com/ebaymotors/BMW-E...item1e65f7dc1d
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Youtube - Electric Fan Swap - Projector Retrofit - Bulb Guide - NY to LA cross country
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Old 09-05-2011, 02:15 PM   #10
polychrome
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Originally Posted by Solidjake View Post
+1 on getting a Behr or Sachs clutch, but.... I would just double the price, do the swap and sell the aux fan and the other parts. THE best thing I ever did to the car.
+1

Taking out the mechanical fan / aux fan combo and replacing it with an electric fan will make that bus/freight truck noise go away. I did mine last week and I'll never go back to the OEM setup.
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Old 09-05-2011, 07:53 PM   #11
Twright
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Before you spend money on an electric fan, make sure it's the fan that's making the noise. On my car, the noise was the power steering pump. Take the mechanical fan off and drive it. If it still makes the noise, it's not the fan. Be careful when you do this and keep the car moving, so that it does not overheat.
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Old 09-16-2011, 07:56 PM   #12
mcguiver7
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Did the electric fan swap today. only took about an hour. noise is finally gone and it even feels a bit more peppy without the drag of the fan.
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