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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 11-12-2006, 08:04 AM   #1
paraklas
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Blower Fan DIY

Did a search on the forum for the lovely "cricket sound" that occasionally appears in our BMWs. I do have the same sound and I know it's the blower fan motor, the one that feeds air in the cabin.

I can hear the cricket sound very well on the lowest fan setting and it goes away as I speed it up. I had exactly the same problem on my E30 which I temporarily solved by spraying LOTS of WD40 in the motor through the air inlet. Problem occurs when dust enters the motor and contaminates the 2 bearings making them "whistle" on low speeds. WD40 or oil does the job but it also acts like a dust magnet, making the problem worse after a few weeks.

Anybody interested for a DIY on how to remove the fan blower and install a new one? Unless there's already a DIY and haven't found it through searching.

This is the fan I'm talking about.. Item #1
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Old 11-12-2006, 08:20 AM   #2
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show me, show me!!
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Old 11-12-2006, 03:50 PM   #3
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Yes, I have this same problem.
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DIY Garage Build (Updated November 18, 2009):

http://forum.e46fanatics.com/showthread.php?t=297607
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Old 11-12-2006, 05:40 PM   #4
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I'll post the DIY within this week.. I'm just waiting for a replacement steering pump from pelican parts to arrive to start working on the car.

Kinda stupid that BMW uses the same fan for the last 21 years (as back as the E30) and I've seen cases of it failing all the time.

There are some holes in the fan shell, I was thinking of blocking them to prevent dust entering but on the other hand, they may be for air cooling..
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Old 02-06-2007, 09:48 AM   #5
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Cleaning blower fan

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Originally Posted by paraklas View Post
I'll post the DIY within this week.. I'm just waiting for a replacement steering pump from pelican parts to arrive to start working on the car.

Kinda stupid that BMW uses the same fan for the last 21 years (as back as the E30) and I've seen cases of it failing all the time.

There are some holes in the fan shell, I was thinking of blocking them to prevent dust entering but on the other hand, they may be for air cooling..
Hello,

I will probably end up ordering the part but in the mean time, do you think using compressed air to spray the blower when it is still in the car would help reduce the chirping? This might be just a temporary fix but one that is easy to do just to get rid of the sound. Up here in Montreal, it's freezing so the heater is always on.

Thanks.

MC
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Old 11-16-2006, 12:45 PM   #6
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Did the fan thing today.. SIMPLY NIGHTMARE to get it out and then back in
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Old 11-16-2006, 07:12 PM   #7
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I have the same problem so please do post the DIY.
Btw, what was the total cost and what's the hardest part?



Rich
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Old 11-17-2006, 09:24 AM   #8
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Cost: $210 for the fan (it's probably cheaper in USA).. It took me around 6 hours to do it, 10 minutes to remove rubbers, screws, covers and 5.9 hours to take the F**** Fan out of the car. I'll post pictures some time later.
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Old 11-17-2006, 10:04 AM   #9
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Interested in this DIY for sure.

I have crickets daily now. And a sporadic fan speed.
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Old 11-28-2006, 08:57 AM   #10
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Quote:
Originally Posted by poynter View Post
Interested in this DIY for sure.

I have crickets daily now. And a sporadic fan speed.
OMG... This noise drives me insane!! Its so bad now that I have to either turn the fan off or all the way up to get it to stop. I can't stand it - make it stop!!

Guess its time to order a new motor or maybe some silicon spray which wont attract dust??
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Old 11-28-2006, 10:34 AM   #11
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post some pics please.
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Old 11-28-2006, 04:54 PM   #12
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Ok here we go...

Take the cabin filter off by removing the 3 plastic screws..


Unclip the wires that go from one side of the car to the other and let them rest on the engine..


Remove the 4 Torx screws that hold the filter assembly.




Now you have to remove the plastic that is between you and the #^%#% fan. There's a plastic screw on the right hand side of the assembly that secures the insulation for the ECU space, remove that screw as well.


There are also 2 screws, one on each side of this cover, remove them as well. It's a bit tricky to come out but it will come off easily if you play a bit with it.




Once the cover is off, you will see the fan assembly. It's held by 2 strong clips and 2 screws. Remove them as well. The left clip can be seen in the first photo!





Once this cover is out, you will see the fan. It's held by 2 screws if I remember correctly. Remove them and be careful not to drop them in the heater assembly! I dropped one and it fell in the bottom engine cover! Had to remove that to get it!

Now the real fun begins.. Once you remove the screws, you will have to disconnect the power connector as well. I found it easier to work there by leaving the wipers in vertical position.
I also removed the 2 engine covers to make more space. Do that it helps!!




I was trying for 4 hours to remove the fan and eventually I broke the plastic blades in an explosion of anger. I was then trying for another 4 hours to get the new fan in without breaking anything.

Can't help with that, you will have to struggle to get it out & in. I also disconnected the left flap to have some freedom of movement. Sorry for the lack of pictures here, it's easy to disconnect it.

Once you successfuly place the new fan, connect the power connector, secure it using the clips that held the old one, test it, and put all the covers back in reverse order.

Last edited by paraklas; 11-28-2006 at 04:57 PM.
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Old 11-06-2007, 05:44 AM   #13
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Paraklas,
I tried to disconnect the LH flap and ended up with a 2-inch black linkage in my hand. Never got the LH flap and the top section of the motor housing off. The linkage went from the bottom of the forward flap towards the flap behind it. I can't figure out how to reinstall it. Any advice? Did you have the LH flap and that section of the motor housing disassembled?
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Old 09-29-2009, 09:47 AM   #14
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Ok here we go...

I was trying for 4 hours to remove the fan and eventually I broke the plastic blades in an explosion of anger. I was then trying for another 4 hours to get the new fan in without breaking anything.

I need to replace my spark plugs so i'll be removing the cabin filter housing and my fan just died so will do that too. Seems like it will be easier to remove the fan while the engine cover is off too!
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Old 04-29-2012, 10:37 AM   #15
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Replacement of Blower Motor: creating access clearance

Quote:
Originally Posted by paraklas View Post

I was trying for 4 hours to remove the fan and eventually I broke the plastic blades in an explosion of anger. I was then trying for another 4 hours to get the new fan in without breaking anything.

Can't help with that, you will have to struggle to get it out & in. I also disconnected the left flap to have some freedom of movement. Sorry for the lack of pictures here, it's easy to disconnect it.

Once you successfuly place the new fan, connect the power connector, secure it using the clips that held the old one, test it, and put all the covers back in reverse order.
This is an excellent thread as far as it goes. However the method for getting the blower into the cavity is not an obvious one.

Taking the engine cover off as suggested above is a start, however an additional inch or so of clearance is required. I have heard many people say that getting access is very difficult, and this is my experience. The objects which block access are massive and have a lot of wires and hoses attached to them.

I have seen posts in which people seriously suggest that dropping the engine a couple of inches for access by undoing the bolts on the engine sub frame is the best way to get access to this fan. This is pretty extreme, and I will try this last.

I have seen a post suggesting that taking the intake manifold off. On a 330 this is a serious job. I have a feeling that on a 325i it may not be quite as bad, but still to R&R the intake manifold on these cars is not a romp in the park.

I will probably remove the intake manifold next, in order to create clearance to install the fan. I have just ordered the gaskets, and I will be looking for limited service items, like hoses, to replace while I am in there. If any one has replaced a blower lately, I would be very interested to hear from them, as to exactly which parts need to come out in order to replace the fan.

Thanks in advance for any help.

Rob

Last edited by Rob_in_LA; 04-29-2012 at 10:45 AM. Reason: clarity
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Old 04-29-2012, 12:43 PM   #16
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Originally Posted by Rob_in_LA View Post
This is an excellent thread as far as it goes. However the method for getting the blower into the cavity is not an obvious one.

Taking the engine cover off as suggested above is a start, however an additional inch or so of clearance is required. I have heard many people say that getting access is very difficult, and this is my experience. The objects which block access are massive and have a lot of wires and hoses attached to them.

I have seen posts in which people seriously suggest that dropping the engine a couple of inches for access by undoing the bolts on the engine sub frame is the best way to get access to this fan. This is pretty extreme, and I will try this last.

I have seen a post suggesting that taking the intake manifold off. On a 330 this is a serious job. I have a feeling that on a 325i it may not be quite as bad, but still to R&R the intake manifold on these cars is not a romp in the park.

I will probably remove the intake manifold next, in order to create clearance to install the fan. I have just ordered the gaskets, and I will be looking for limited service items, like hoses, to replace while I am in there. If any one has replaced a blower lately, I would be very interested to hear from them, as to exactly which parts need to come out in order to replace the fan.

Thanks in advance for any help.

Rob
Okay. I am a Newby and I missed the many interesting suggestions written AFTER the early post which I referenced. Apparently removing some of the windshield wiper structure will help. Lots to read here.

Last edited by Rob_in_LA; 04-29-2012 at 12:49 PM.
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Old 11-28-2006, 05:01 PM   #17
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thank you for the photos.
Frustration and tension already building within me, knowing that I have to do this.
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Old 11-28-2006, 05:06 PM   #18
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Best of luck!!
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Old 11-29-2006, 09:52 AM   #19
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Do you know the part number on that particular blower fan you replaced? It looks to be 64118372797 but just wanted to verify. And what model and year is your car?

Perhaps what's interesting is that there is another DIY for the same symptoms but it replaced a wholly different fan. I did the DIY in the below link, and I haven't had any cricket sounds return, but I wonder if perhaps I replaced the wrong fan.

http://forum.e46fanatics.com/showthread.php?t=298527
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Old 11-29-2006, 11:08 AM   #20
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Originally Posted by Normstorm View Post
Do you know the part number on that particular blower fan you replaced? It looks to be 64118372797 but just wanted to verify. And what model and year is your car?

Perhaps what's interesting is that there is another DIY for the same symptoms but it replaced a wholly different fan. I did the DIY in the below link, and I haven't had any cricket sounds return, but I wonder if perhaps I replaced the wrong fan.

http://forum.e46fanatics.com/showthread.php?t=298527
I think you'll see in that thread at least one person who replaced the other fan and still has the cricket sound. It looks like the "cricket sound" can have more than one source.... Thats for that link! I have the same problemand it sounds like its coming from behind the dash and its on ALL the time (not just with the fan). Will try that method first with just some grease to see if it stops. If not than Ill try this DIY.
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