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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #101  
Old 03-15-2011, 05:22 PM
BlackThunder BlackThunder is offline
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Is there anybody that had the case that a faulty blower motor caused a faulty FSU blower motor resistor? I am asking because I am suspicious that blower motor would be in bad shape or the fuse for the blower motor was replaced and upgraded to a higher fuse capacity (ie. from 20amp to 40amp) just to keep the blower running.
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  #102  
Old 03-15-2011, 08:09 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by BlackThunder View Post
Is there anybody that had the case that a faulty blower motor caused a faulty FSU blower motor resistor? I am asking because I am suspicious that blower motor would be in bad shape or the fuse for the blower motor was replaced and upgraded to a higher fuse capacity (ie. from 20amp to 40amp) just to keep the blower running.
I don't know fact but there have been MANY who 'suspected' the blower motor actually blew the FSU (in some cases, multiple FSUs).

For example, see this from a couple days ago (03-11-2011):
- Heater motor issues?
Quote:
I have replaced the 'FSU' 3 times now. The garage says the 'FSU' is OK and that the 'heater motor' is broken and that the 'heater motor' destroys the 'FSU'.
In the the VERY best of E39 Links, you'll find more details:

- FAN CONTROL GOES HAYWIRE: poorly ventilated final stage resistor/final stage unit (FSR/FSU) modules that are practically sure to go haywire due to poor heat-sink design (1) (2) (3) (4) (5) (6) (7) (8) ... Autopsy (1) (2) often causing the battery to drain overnight (1) (2) (3) & how to isolate and replace the blower motor (1) (2) (3) (4)
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  #103  
Old 03-23-2011, 12:52 PM
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mikevaquez mikevaquez is offline
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Just did mine today and it was a breeze thanks to your instructions. Thanks for a good DIY!
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  #104  
Old 04-09-2011, 09:29 AM
Tom Moore Tom Moore is offline
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Awesome DIY. I've ordered the part and perhaps I'll report back on how it went. Just the size of that radiator array tells you there is too much stress on this part! Hopefully the new ones are up to the job...
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  #105  
Old 04-09-2011, 02:09 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by Tom Moore View Post
Just the size of that radiator array tells you there is too much stress on this part!
And, all it does, apparently, for all that heat dissipation, is control something as simple as the fan speed.
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  #106  
Old 04-18-2011, 05:27 PM
willyhood willyhood is offline
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I'm new and not sure if I'm putting this in the right place, but on a 2001 325i, what fuses do I need to check for a heater/ac blower that does not work at all?

Last edited by willyhood; 04-18-2011 at 05:29 PM. Reason: wanted to be clearer
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  #107  
Old 04-18-2011, 08:27 PM
Starless Starless is offline
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Quote:
Originally Posted by willyhood View Post
I'm new and not sure if I'm putting this in the right place, but on a 2001 325i, what fuses do I need to check for a heater/ac blower that does not work at all?
Do not remember off top of my head, but there should be a fuse chart in the fuse compartment. Is yours missing?
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  #108  
Old 04-19-2011, 09:01 AM
willyhood willyhood is offline
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what fuses control ac/heater blower on 2001 325i BMW

Thank you for your reply, Alex. I do have a fuse chart, but I'm told there are several fuses that relate to the blower, and want to make sure I test them all.
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  #109  
Old 04-20-2011, 08:23 AM
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Fifty_Cent Fifty_Cent is offline
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Quote:
Originally Posted by Fifty_Cent View Post
Mine started having the same problem on startup...I can hear the fan speed pulsating, and then it will work ok....wonder if its the same problem...
So is this BEHR product a good part to change the oem with?
Blower Motor Resistor (Final Stage Unit) for BMW vehicles

*******>********>
Zoom in

Name: Blower Motor Resistor (Final Stage Unit)
Part Code: 64 11 6 920 365
Brand:
Description: A/C Heater blower motor resistor (aka final stage unit).


Price: $64.90


Quantity: ******* style="WIDTH: 30px" id=ctl00_Zone1_tbQuantity value=1 maxLength=3 name=ctl00$Zone1$tbQuantity>******* style="BORDER-RIGHT-WIDTH: 0px; PADDING-LEFT: 10px; BORDER-TOP-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; BORDER-LEFT-WIDTH: 0px" id=ctl00_Zone1_btnAddToCart alt="Add to Shopping Cart" align=absMiddle src="../App_Themes/default/Images/btnAddToCart.gif" type=image name=ctl00$Zone1$btnAddToCart>
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  #110  
Old 04-20-2011, 04:23 PM
Starless Starless is offline
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^^^ Yes, the BEHR unit part # ending in 0365 is a good FSU.
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  #111  
Old 04-20-2011, 04:58 PM
willyhood willyhood is offline
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Is it true that in the 2001 325i, I should be mindful of a midyear product change in the FSU final resistor for the blower?
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  #112  
Old 05-06-2011, 11:43 PM
conrad721 conrad721 is offline
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Quote:
Originally Posted by Starless View Post
^^^ Yes, the BEHR unit part # ending in 0365 is a good FSU.
yup, i too got BEHR from the dealer.
used this DIY and got my fan working again.
i completed it in about 1.5 hrs.

never had any fan oscillating problem.
however, i experienced it stop and work again.
then one day it just died.

thanks to starless.
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  #113  
Old 05-07-2011, 06:02 AM
Keomapedro Keomapedro is offline
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I just got my first BMW. It's a 2001 320I. Reasonably well maintained.
I've noticed the first issue. The blower is pulsating intermittently. It's ramping like: "voom", "voom", "voom", "voom". Mainly on 1st & 2nd speed. When I switch to 3rd & 4th, it runs continuously. Can someone please help? Thank you, K.Pedro.
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  #114  
Old 05-07-2011, 02:09 PM
slimg00dy slimg00dy is offline
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this took me about 3 hours to do particularly on picture 6 I didnt realize the there were 2 screws holding the motor mount. if you could please specify that there is a hidden screw on top that would be great.
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  #115  
Old 05-07-2011, 02:11 PM
slimg00dy slimg00dy is offline
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by the way thanks.
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  #116  
Old 05-10-2011, 03:42 PM
hhariri hhariri is offline
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Smile

Well after 61k the dreaded FSU finally went bad on me a month ago. Used this excellent DIY to replace it over the weekend. Took just under 2 hours.

Thank you Starless (Alex?) for sharing. You have saved a lot of people a lot money!

Cheers
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Last edited by hhariri; 05-10-2011 at 04:07 PM.
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  #117  
Old 05-11-2011, 09:35 PM
cfmdev2000 cfmdev2000 is offline
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Mine stop functioning today no ac nor heat in fact no air blowing period, how can I make sure it's not the blower motor or booth? Excuse me but I have never done a single repair and am a total noob....... HELP

Last edited by cfmdev2000; 05-11-2011 at 09:41 PM. Reason: Typo
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  #118  
Old 05-11-2011, 09:42 PM
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catso catso is offline
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Quote:
Originally Posted by cfmdev2000 View Post
Mine stop functioning today no ac nor heat in fact no air blowing period, ow can I make sure it's not the blower motor or booth? Excuse me but I have never done a single repair and am a total noob....... HELP
Start with checking the fuse.
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  #119  
Old 05-12-2011, 09:16 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by Starless View Post
Do not remember off top of my head, but there should be a fuse chart in the fuse compartment. Is yours missing?
From the VERY best of E39 Links thread:

- Where to find E39 fuse boxes (1) (2) (WDS) (WDS.ru) & how to find the front passenger seat undercarpet fuse panel (1)
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  #120  
Old 05-14-2011, 02:21 PM
Tom Moore Tom Moore is offline
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Fabulous DIY! Thank you so much! About the only thing I could have used was a note about that extremely hard to see or reach bracket screw being nicely caught in a horizontal channel leading to the screw hole. That made it a whole lot easier to reinstall than I feared when I started unscrewing it!

Three cheers for Starless!
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  #121  
Old 07-14-2011, 08:09 PM
Splitknuckle Splitknuckle is offline
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Smile Thank you Starless for your pictorial post

Starless, thanks for your post on replacing the AC blower resistor. It was excellent and I had no problems following your instructions. Fixed the problem and saved $460 over the dealer quote!!!$$$
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  #122  
Old 07-14-2011, 09:26 PM
Starless Starless is offline
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Quote:
Originally Posted by Splitknuckle View Post
Starless, thanks for your post on replacing the AC blower resistor. It was excellent and I had no problems following your instructions. Fixed the problem and saved $460 over the dealer quote!!!$$$
No problem, glad it helped!
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  #123  
Old 07-15-2011, 02:36 AM
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bluebee bluebee is offline
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For the record, we're 'still' trying to (anecdotally) identify which is the 'right' FSU/FSR to buy (that won't fail):

- What is the right brand FSU/FSR to purchase when your interior heating & air conditioning HVAC/IHKA blower motor goes haywire (1) (2)

If you have information about which brands fail on the E46, that would be helpful to add to that thread.
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  #124  
Old 07-26-2011, 07:03 AM
CQHixi CQHixi is offline
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Same for a 2002 330ci?

Nice pics, excellent job in describing the fix. I suspect I have to go through this, my display works 100% of the time but the blower is inconsistent--sometimes it blows like it should, sometimes it blows really hard and then really soft (alternating for the entire trip) and sometimes it just decides to quit blowing altogehter. At least the display thinks it's working!
Anyhow, I noticed that this is for a 2001 325, I wonder if it's the same as for a 2002 330ci? From other forums and online searches I think I've heard the FSU location described as being behind the glove box, so this sounds right--just want to confirm that with someone if at all possible before I get to ordering the part....
Thanks in advance,
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  #125  
Old 07-26-2011, 11:21 AM
Starless Starless is offline
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Quote:
Originally Posted by CQHixi View Post
Nice pics, excellent job in describing the fix. I suspect I have to go through this, my display works 100% of the time but the blower is inconsistent--sometimes it blows like it should, sometimes it blows really hard and then really soft (alternating for the entire trip) and sometimes it just decides to quit blowing altogehter. At least the display thinks it's working!
Anyhow, I noticed that this is for a 2001 325, I wonder if it's the same as for a 2002 330ci? From other forums and online searches I think I've heard the FSU location described as being behind the glove box, so this sounds right--just want to confirm that with someone if at all possible before I get to ordering the part....
Thanks in advance,
Yes, what you are describing IS the symptom of a bad FSU. It fails on all e46 cars, it does not matter if it's 2001 325i or 2002 330i. I would not hesitate to order and install the part.

Last edited by Starless; 07-26-2011 at 11:26 AM.
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