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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-09-2014, 09:13 PM   #1
redman4ever
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Join Date: Apr 2011
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A/C Woes

Hey guys, have an issue I'm hoping you can help me nail down. First off, I live in Mississippi and it just gets plain hot. I've been having some trouble with my air conditioner.

I have a 2003 e46 and the air works great, in that it is cold. The problem then is that it simply does not blow well. It use to be more intermittent were it would blow full blast then decrease, although still reading on high with the control unit. Now, unfortunately, when the fan setting is on high it will blow cold air but simply not enough.

If anyone has any information as to the specific nature, I would appreciate it. I don't know if its the blower, the control unit, or another part that is simply unknown to me.


Any feedback would be awesome, thanks!
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Old 09-09-2014, 10:40 PM   #2
tottle2
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This sounds like the FSR (final stage resistor). There are tonnes of threads and DIY's on how to diagnose and replace. Hope that helps!
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Old 09-10-2014, 12:12 AM   #3
redman4ever
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Awesome thanks, I started reading about the FSR and wondered if this was a possibility but didn't see anything with my cars exact symptoms.
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Old 09-10-2014, 12:33 AM   #4
BaliDawg
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If your fan speed is incorrect, especially if it has been intermittant, good chance it is the FSR. Make sure you pick a good DIY on here that explains how to test if the FSR is bad or not. No sense replacing parts that aint broke.
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Old 09-10-2014, 11:55 AM   #5
SDpnoy
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Quote:
Originally Posted by tottle2 View Post
This sounds like the FSR (final stage resistor). There are tonnes of threads and DIY's on how to diagnose and replace. Hope that helps!
+1

My AC was doing the same just like yours. Replace the FSR and all is fixed =)
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Old 09-10-2014, 02:23 PM   #6
redman4ever
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Thanks guys! I went ahead and ordered the part. I'll update once I install.
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Old 09-25-2014, 09:34 AM   #7
DEADF15H
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+1 FSR, and if it isn't now, it will be, if it hasn't been replaced since new, they changed the design, so don't be shocked when your new one looks different than your old one.
It is a pain in the arse to get to, so look up a couple of DIYs on here and youtube. I used the Bentley Manual, but there has to be an easier way.

Here's the video link from SolidJake, search him on forum to find a DIY with pictures, that he posted in.
It's not hard to change if you have small hands and don't mind lying on your back with your feet on the headrest and a flashlight in you mouth! LOL

Last edited by DEADF15H; 09-25-2014 at 10:04 AM. Reason: Found Video
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Old 09-25-2014, 09:56 AM   #8
Swater330i
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I have the exact problem. I have a FSR and blower motor on order, set to arrive on the 29th so when I get them installed I will let you know of the results, OP.
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This 323 would most likely handle and drive better than a stock e46 m3.
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Old 09-27-2014, 08:48 PM   #9
DEADF15H
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Originally Posted by Swater330i View Post
I have the exact problem. I have a FSR and blower motor on order, set to arrive on the 29th so when I get them installed I will let you know of the results, OP.
99% sure you'll have no problems after replacing both of those.
Replaced my FSR more than a year ago. Now my blower has started to sing. Looked the part up to order last night, but it's must have strained a vocal cord as it was silent today.

Sent with BimmerApp using a Note 2, probably from the driver's seat of a BMW

Last edited by DEADF15H; 10-10-2014 at 09:57 AM. Reason: In addition: Old design FSRs are known to start electrical cars under the glove box.
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Old 09-27-2014, 09:12 PM   #10
NumbaOneNewb
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hm.... i'm a little skeptical but let's see. if it doesn't work, perhaps you should go check on that aux fan of yours, and make sure its working when the a/c is engaged.
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Old 09-27-2014, 09:17 PM   #11
Swater330i
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Quote:
Originally Posted by DEADF15H View Post
99% sure you'll have no problems after replacing both of those.
Replaced my FSR more than a year ago. Now my blower has started to sing. Looked the part up to order last night, but it's must have strained a vocal cord as it was silent today.

Sent with BimmerApp using a Note 2, probably from the driver's seat of a BMW

Last December the blower motor sounded like a French horn on all speeds until it spun for a while. It was actually kind of amusing
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I am going to install M3 fender grill on my 323ci.
Quote:
Originally Posted by futureSubie View Post
IMO, the euro clear corners looks too aftermarket/ricey.
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Originally Posted by Davconelectric View Post
This 323 would most likely handle and drive better than a stock e46 m3.
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