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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 06-13-2010, 09:41 PM
gcbimmer gcbimmer is offline
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Mein Auto: 2001 540i/6
1998 328i ac/heat not working...need help!!

Need help... 1998 328i ac/heat not working. The climate control computer lights are out and pushing the buttons does not activate the blower. It seems to have a mind of it's own and works on occasion, but under no certain circumstances. Any suggestions on what the problem is or what can be done to repair this before it has to go to the indy?

Thanks in advance!!
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  #2  
Old 06-14-2010, 10:05 AM
gcbimmer gcbimmer is offline
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Did I not give enough info? Did I post to the wrong forum? Or has no one had this problem?

Thanks.
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Old 06-14-2010, 10:15 AM
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jonesin jonesin is online now
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Did you look at your fuses and relays?

Have you used a voltmeter to see if the unit itself is getting power?

Are the wires going to it in good condition? Have they been chewed by what looks like a mouse?
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Old 06-14-2010, 10:16 AM
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Also with what's wrong, it helps us immensely for you to tell us what you have tried/done.
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Old 06-14-2010, 10:17 AM
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ZeGerman ZeGerman is online now
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This doesn't sound like it's a blower resistor or final stage unit. Rather, it seems like it's a problem with the climate control head unit itself, or possibly some wiring as mentioned above. Does THIS article help any?
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  #6  
Old 06-14-2010, 10:52 AM
gcbimmer gcbimmer is offline
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Originally Posted by jonesin View Post
Also with what's wrong, it helps us immensely for you to tell us what you have tried/done.
I just got to look at it yesterday for a friend of mine. I figured I could get pointed in the right direction before the elimination process begins. I was just hoping to get a game plan together and take it from there.
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Old 06-14-2010, 10:58 AM
gcbimmer gcbimmer is offline
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Quote:
Originally Posted by ZeGerman View Post
This doesn't sound like it's a blower resistor or final stage unit. Rather, it seems like it's a problem with the climate control head unit itself, or possibly some wiring as mentioned above. Does THIS article help any?
I did see that article when I was doing some research prior to even seeing the car...thanks. We'll have to check the wiring and go from there. As I mentioned in the earlier reply I just saw the car yesterday and it was a quick look and it was just a look.
Thanks again.
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  #8  
Old 06-16-2010, 04:00 PM
Leusent Leusent is offline
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Mine does that exact same thing. Fuses are OK. Honestly didn't check relays, though in retrospect I should have. I ordered a new FSU because I had done a lot of research and that appeared to be the most likely cause (I realize most FSU failures don't act this way, but this type of behavior has been seen). My next best guess is a physical break in the wire going to the blower. I have also read about the circuit repair in at actual head unit, but that behaviour doesn't seem to match up -- there is no visible issues with the display on the unit.

I should be able to pop in the FSU on Friday morning. I'll let you know. If you figure it out before me, give me a heads up so I can try to return the $107 FSU part

Craig

Last edited by Leusent; 06-16-2010 at 04:05 PM.
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  #9  
Old 06-18-2010, 12:55 AM
Leusent Leusent is offline
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Replacing the FSU fixed my problem. See: http://forums.bimmerforums.com/forum....php?p=3349096

Note that those install instructions weren't 100%, but pretty close.

Craig
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Old 06-18-2010, 12:56 AM
Leusent Leusent is offline
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By the way, hi Jonesin. I drive the same car as you (1997 though) and I'm in Ottawa too. Catch you around sometime.

Craig
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Summer: 1983/1984/2007 Honda CB550SC/VF500F/CBR600RR (2-Wheel)
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