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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 03-03-2012, 11:50 PM   #161
Leuk
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Problems after swap.

Hey everyone. My mechanical shredded the cowling last week. Saw a minor fluid leak afterwards. Decided to do replacements and swap. Ordered up motor mounts, new radiator, hoses, sensors, stainless water pump, resevoir, electric fan and thermostat. The motor mounts (although original) looked like the new ones when I pulled them, just dirtier. So I got it all assembled and now I am overheating. The lower hose out of the thermostat doesn't feel as hot as I think it should. The new electric fan isn't spinning, even though I am approaching red on the stat. I tried plugging in the aux fan, and it spun a couple times, but really slow (not enough to move air.) But as it was overheating, it didn't spin at all. I got a new Behr themostat from Turnermotorsports (they had rubbed off a lot of the detail on the plastic and some numbers off the metal impelers.) I got the Bosch fan from oembimmerparts. Has anyone had any problems with these products or vendors? My original stat was fine, so I am leaning towards putting that back in to verify the issue. Thought I would reach out before I spilt more fluid. Feedback appreciated. Thanks.
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Old 03-04-2012, 08:22 AM   #162
Sansho
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You need to bleed your cooling system of air. This is a common problem. See this thread: http://www.e46fanatics.com/forum/sho...d.php?t=689618
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Old 03-04-2012, 11:39 AM   #163
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Thank you.

Awesome. Thanks for the info. Never would have guessed, just the BMW way. I did the bleeding and all is now well. As an FYI. I tried the tubing hose in the old bleeder cap and it made a mess (all the fluid leaked between the hose and the cap, none actually went up the tube.) I am going to wait until it dry's and put some RTV around the tube and then shove it back in. Then if I ever need it in the future, it will be ready to go.
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Old 03-27-2012, 03:10 PM   #164
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Had a 75 degree day and after my swap last fall this is the first real test of hot weather. How long should the fan run after turning the car off? It ran for 15 mins so I unplug connector and let it sit for a min then plugged backed in and fan did not turn on. I move the car 20 feet and fan came back on and then keep running again after I turned off. Had to leave so unplugged again.
Gonna test again but wanted some ideasof how long it should run when car off. Thanks
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Old 03-27-2012, 11:51 PM   #165
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Mine has never ran after shutting the car off. Even in 95 degree weather last summer.
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Old 03-28-2012, 03:12 PM   #166
Danoff
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Has anyone tracked their car after doing this swap?
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Old 03-30-2012, 11:37 PM   #167
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I have a 2000 323Ci. The previous owner did this swap. the car keeps over heating if I let it sit still. The fan never comes on. Is there a way to test the fan? Does this fan have a hi/low speed resistor? If so is there a way to bypass it and let the fan run on hi? I have a Mini Cooper S and on it if that resistor goes bad the fan will not work, but you can replace just the resistor. I don't thank that is the case on a BMW.
I just had the sub-frame fix so I really don't won't to spend more money if I can avoid it.
Thanks I hope someone can help
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Old 03-31-2012, 11:54 AM   #168
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Had problem below and tested again yesterday at 72 degrees F. Drove 10 miles highway to destination and fan quit when I turned off car. Drove home 2 hours later and fan stayed on when truned off car. I put in the Behr fan is there a sensor some where that maybe going bad? help!!!!!!!!! Heat is coming and opening the hood every time to unplug is going to be anoying



Had a 75 degree day and after my swap last fall this is the first real test of hot weather. How long should the fan run after turning the car off? It ran for 15 mins so I unplug connector and let it sit for a min then plugged backed in and fan did not turn on. I move the car 20 feet and fan came back on and then keep running again after I turned off. Had to leave so unplugged again.
Gonna test again but wanted some ideasof how long it should run when car off. Thanks
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Old 03-31-2012, 12:24 PM   #169
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If it runs for more than 15 mins after the engine is off, your engine is running usually hot for some reason (watch the temp gauge when you shut it off) or something is wrong with the installation. Behr is a good unit. I wish I could help diagnose it, but if it were my car, I'd take it to a trusted mechanic and have him check it over if I could not figure it out myself.
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Old 03-31-2012, 02:03 PM   #170
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Thanks. The temp gauge is spot on center when warmed up and never goes over so don't think it's getting to hot.
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Old 03-31-2012, 02:31 PM   #171
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The fan is turned on by the computer based on 5 factors:
  • Coolant outlet temperature, measured in the lower radiator hose
  • Calculated catalyst temperature
  • Vehicle speed
  • Battery voltage
  • Air Conditioning pressure (calculated by IHKA)

After turning the engine off, the electric fan can run at varying speeds for up to 10 minutes.
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Old 03-31-2012, 04:25 PM   #172
MCS02
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Hi
I disconnected the coolant outlet temp sensor on the lower radiator hose and the fan works. I am going to leave it unplugged till I can get a new one.
Thanks
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Old 04-12-2012, 09:37 AM   #173
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I'm pretty sure this was posted, but I want to make sure. This is only for autos? Manuals already have the electric fan?
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Old 04-12-2012, 09:41 AM   #174
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Originally Posted by Chris3Duke View Post
I'm pretty sure this was posted, but I want to make sure. This is only for autos? Manuals already have the electric fan?
Only for autos. Manuals already have the electric fan.
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Old 04-25-2012, 11:01 AM   #175
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Jake, I hope that you can finish your write-up when you have some free time. The videos are nice, but aren't necessary.

Coupe Front Bumper Removal - http://www.e46fanatics.com/howto/how...hp?howto_id=40
Sedan Front Bumper Removal - http://www.e46fanatics.com/howto/how...hp?howto_id=41

Notes from doing this last night..

- Be careful with the bumper
- The four plastic expanding rivets holding the aux fan shroud in place were impossible to remove without breaking them. I become quite good at tearing them apart. Back out the center portion using a phillips head screwdriver. Attempt proper extraction. If it doesn't budge, take a flathead to the plastic cuff so that you can grab it with a pair of pliers. I twisted the plastic cuffs until they broke, and then pushed the expanding rivets back. Have replacements handy - it'll be far quicker than getting a ziptie through the holes. Driver's side was difficult to ziptie into place with less access.
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Old 04-26-2012, 01:24 AM   #176
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Quote:
Originally Posted by yetieater View Post
- The four plastic expanding rivets holding the aux fan shroud in place were impossible to remove without breaking them.
when removing the aux fan today on my 05, those expanding rivets were actually expanding screws, and were also impossible to reuse.
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Old 04-28-2012, 06:35 PM   #177
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+1 yea getting new screws before hand is nice.

yetie, how do you like the swap?
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Old 04-30-2012, 04:54 PM   #178
yetieater
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I ran without the mechanical fan for about a month, and could probably could have kept at it. The swap eliminates truck noise. I like it, but I get the feeling that there isn't a big market for items like my 100k mile fan clutch or the auxiliary fan.
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Old 05-01-2012, 09:59 PM   #179
goose123
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Looking to do this as my next DIY, thanks OP for putting it up. When I search Ebay, it is showing me a Behr Aux fan, is it what I need?

Here it is:

http://www.ebay.com/itm/BMW-E46-Auxi...f7df66&vxp=mtr
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Old 05-01-2012, 10:39 PM   #180
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Quote:
Originally Posted by goose123 View Post
Looking to do this as my next DIY, thanks OP for putting it up. When I search Ebay, it is showing me a Behr Aux fan, is it what I need?

Here it is:

http://www.ebay.com/itm/BMW-E46-Auxi...f7df66&vxp=mtr
That's exactly what you need. I got the same one, from the same seller. Legit
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