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Old 10-13-2009, 06:06 PM   #1
markierant
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HVAC capacitor fix ?

So I took out my hvac unit to perform the now famous fix. I believe from reading up that the fan should be running on hi / full heat when you disconnect the unit. Well I still get an intermittent hi heat or nothing at all, as the car wishes, and its very unpredictable, I'm not getting any fan speeds in between its either full on or off with the unit removed. I found that when I start the car in the morning and the fan starts blowing HI, it turns off when I idle down at a red light, but then goes back on when I bring the revs up while driving, of course sometimes I don't get the fan at all in the morning (all with the hvac unit removed, for a couple of days now) Could there be anything else wrong, I want to make sure before I take the unit apart and replace the capacitor.
Help
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Old 10-13-2009, 09:44 PM   #2
LondonWraith
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i think there might be. mine was exactly the same and when i had new cap soldered in it helped a little bit but my unit still isn't working 100%. i tried 3 differant caps and still no fix so i'm thinking there is a problem elsewhere.
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Old 10-14-2009, 10:13 AM   #3
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Capacitor fix for me was to fix the digital display to work at all period.

You have a final stage issue (which i'v also had shortly after the capacitor fix), pretty pricy dealer part ($200+ and non refundable) but easy to change and common. You'll find that on behind the havac unit on the drivers footwell.

Not sure what you mean by "when removed", nothing should work with either componet removed.
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Old 10-14-2009, 10:54 AM   #4
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You can get the FSU at http://www.bimmerspecialist.com for $110 shipped.

That fixed my problem.
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Old 10-14-2009, 02:32 PM   #5
LondonWraith
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Quote:
Originally Posted by jeffrie View Post
Capacitor fix for me was to fix the digital display to work at all period.

You have a final stage issue (which i'v also had shortly after the capacitor fix), pretty pricy dealer part ($200+ and non refundable) but easy to change and common. You'll find that on behind the havac unit on the drivers footwell.

Not sure what you mean by "when removed", nothing should work with either componet removed.
sure it will. when you pull the heater unit out and unplug it the fan should blow on high constantly until you pull the fuse
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Old 10-14-2009, 02:41 PM   #6
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Now that you make me think of it... I never tried it unpluged.
Only time I pulled it was to fix it (replace the capacitor) and put it back in right after, only took about 20 mins and doubt I even had a key in the ignition till I tested it.
Lucked out too I geuss as first try and it worked flawlessly ever since.
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Old 10-14-2009, 05:08 PM   #7
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i just soldered in a new capacitor and still have the same intermittant problem.
any ideas?
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Old 10-14-2009, 06:47 PM   #8
markierant
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Very good post here on how to replace the FSU and any symptoms related to it.

http://forums.bimmerforums.com/forum...d.php?t=292522
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Old 10-14-2009, 06:50 PM   #9
markierant
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As in that post, my HVAC control unit works , all buttons respond to inputs, it's only the fan that does whatever it wants. Definetly think it's the FSU, I will order one today.
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Old 10-28-2009, 10:39 PM   #10
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It was definitely the Final Stage. Replaced it and everything works as it should.
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