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Go Back   E46Fanatics > Tuning & Tech > DIY: Do It Yourself

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 11-22-2011, 12:17 AM   #101
steve.325i
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Ok, fan mod complete. I wasn't expecting to do it until next weekend, but a leak from my expansion tank got me in there & I decided to take the day off & wrap it up.

So, some notes:

1. Getting the bumper off a facelifted e46 is a pia when you are doing it for the first time. The plastic retainers to the front fender are a *****.

2. I left my aux fan shroud in place. I didn't want see the cross-members through the front grill. That said, my mod is definitely NOT reversible now. I hacked my aux fan. I took pics & I will post it tomorrow.

3. Holy crap! I can hear my engine running! I didn't think the mech. fan was that loud. Holy crap!

4. From my two 10 minute test drives (checked in between for coolant leaks) I can honestly say that my engine has never run so smooth. Maybe my mech fan was out of balance?!?

5. Thanks guys (Jake, Olaf, & others) for talking me into this.

Last edited by steve.325i; 11-22-2011 at 12:18 AM.
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Old 11-25-2011, 08:25 AM   #102
corv75
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Is the fan suppose to be on all the time or just when the car calls for it. I have it in and started the car but it did not come on. Its only 40 degress and I only ran for 5-8 minutes as I was looking for coolant leaks and noise's after doing new cooling system.
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Old 11-25-2011, 08:44 AM   #103
Solidjake
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Steve, very nice man. Enjoy.


Corv, comes on when it needs to.
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Old 11-25-2011, 08:46 AM   #104
Sansho
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Quote:
Is the fan suppose to be on all the time or just when the car calls for it.
Fan only comes on when it's needed. These are the inputs that the system uses to determine when to turn the fan on:
  • Coolant outlet temperature (lower radiator hose sensor)
  • Calculated (by the ECM) catalyst temperature
  • Vehicle speed
  • Battery voltage
  • Air Conditioning pressure (calculated by IHKA)
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Old 11-25-2011, 09:28 AM   #105
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Thanks for your replies. This site and it's members are amazing!!!!!!
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Old 11-29-2011, 10:38 PM   #106
mrbudman13
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Can I put this fan on my auto steptronic. My mech fan has a cracked blade car is 2004 325i and I would really like to get rid of that crappy mech fan. Thanks for this DIY hope I can do it.
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Old 11-29-2011, 10:46 PM   #107
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OK looked at DIY again and solidjake is removing his mech fan for this one thought he had a manual will let all know how it goes.
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Old 11-30-2011, 10:57 AM   #108
Solidjake
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I have steptronic. No issues at all.
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Old 12-02-2011, 02:08 PM   #109
s142s14a
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Is this a non-M3 mod only? I want to get rid of my mechanical fan.
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Old 12-02-2011, 02:18 PM   #110
Solidjake
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For the M3 they would have put the electrical fan in in the first place, but they chose both mechanical and aux for a reason. For an M3 idk if I would do it...
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Old 12-02-2011, 03:32 PM   #111
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S54 produces more heat than M54. Seems like two fan configuration (pusher-electric and mechanical) is more efficient than one electric fan. Probably, it is still fine to do the mod on M3, but have to watch the temperature.
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Old 12-07-2011, 08:17 PM   #112
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My 2001 325ci has elec fan only and I love it.
It was my first BMW to have it and the temp guage never moves, even in 102 degree days w a/c on in texas.
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Old 12-16-2011, 12:11 PM   #113
sebbyk15
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I just ordered my new fan for this DIY, can't wait for it to come in so I can do the swap, Just wanted to thank people for this thread. Makes things a lot easier and clearer for the swap. Thanks guys!
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Old 12-18-2011, 01:06 PM   #114
SUHLeen
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So which unit is the right one? Is it the Behr or the Bosch? Because everyone here is saying Behr but I believe the one I bought from the dealer is a Bosch?
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Old 12-18-2011, 02:00 PM   #115
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I installed a Bosch unit in mine.
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Old 12-18-2011, 02:17 PM   #116
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I ordered the Bosch also hope it does not matter I found it for $250 delivered some places are selling these fans for $300 to $400+...
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Old 12-18-2011, 05:32 PM   #117
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Bosch fits and works just fine for me.
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Old 12-19-2011, 10:36 AM   #118
corv75
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I did behr and it went in perfectly and connected and works great.
Got for 200 with free shipping off ebay.
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Old 12-21-2011, 12:43 PM   #119
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Half a year later and no issues!
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Old 12-21-2011, 12:44 PM   #120
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Same here.
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