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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 04-11-2005, 01:07 AM   #1 (permalink)
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Hello, I need help with the digital A/C control unit. Is there anyone out there who expierenced the same problems, or knows how to go about it, relays, fuses,...?

I am having random electrical glitches in AC control unit.
There are usually several short ones (seconds), or sometimes very long (minutes)
The glitches trigger the fan to shift speeds accordingly.
During a glitch,
The blower shuts off, and fan shifts to LOW.
I can see a very dim illumination of the prior digital setting.
Also, the side buttons stay on if were selected before.
And, I can't toggle them until the glitch ends.
When the glitch ends, illuminated settings come back, and fan shifts to HIGH.

Also:
Maybe someone can help figure out what could be at fault with my driver seat heating.
The passenger side works fine.
When turning on the driver's side heating switch, the selection light turns on, stays lid for roughly 5 seconds and goes back out. Does anyone know what this could mean? The connections under the seat seem to be ok.

Thanks for any comments you may have...
Vadim
'97 328i
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Old 04-11-2005, 08:12 AM   #2 (permalink)
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you may just have to replace the whole digital unit for the climate control, i have heard of them going bad and it is all in that peice, a simple swapout usually fixes the problem, it doesn't sound like a bad fuse or anything like that to me but you never know, could be a short, have you pulled it out before to check for any crossed wires and any uncovered wires?
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Old 04-11-2005, 09:37 AM   #3 (permalink)
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I just had this same problem with the climate control. I took it to the stealership and they quoted me about $500 to replace the unit. I then found a post that had the following DIY fix: http://www.macadamizer.com/bmwfix.html.

I did not want to chance frying the board so I sent mine out to a guy I found on e-bay. He charged me $45 (including shipping) and the unit works perfectly. Here's the link: http://cgi.ebay.com/ebaymotors/ws/eBayISAP...ssPageName=WDVW.

Hope this helps.
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Old 04-11-2005, 04:32 PM   #4 (permalink)
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Old 04-12-2005, 12:08 PM   #5 (permalink)
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Thanks guys
I used http://www.macadamizer.com/bmwfix.html.
This guy is a genius. But yes indeed in worked. Anyone else who has this exact problems should do it. Very easy.

He replaced a simple capacitor, that controled the main power coming to the circuit. He said it was .47uF / 35v. But other people used larger values and it still works, just make sure the rating is above 35V. I used a 10uF/50v. Works great.

Anyone know the mystery to my driver heated seat? The drivers heat switch goes on when selected, and goes off after 5 sec. Where as the passengers stays on and the heating works. Connections under seat seem to be connected.\

Thanks

97 328i
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