A/C problem with 733i

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  #1  
Old 07-27-02, 08:31 PM
DBinSD
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Question A/C problem with 733i

I jave an 84 733i and have problem with the dash control buttons for A/C & Heating system. I turn the fan wheel on, set the temp wheel and then push a button. Sometimes they work and sometimes they don't. So what's happening is the fan won't even blow when they don't work. Could this be a relay switch problem? If so, does anyone know exactly where it's located on this car?

BTW... checked fuses and they are fine.
 
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  #2  
Old 07-27-02, 08:34 PM
Joe_F
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Does the fan just not work or the SYSTEM (no cold air) not work?

If it's the fan, it could be the relay or the blower resistor (if so equipped).

Try the autolibrary link I have bookmarked below to see if they have anything on it.
 
  #3  
Old 07-27-02, 08:38 PM
DBinSD
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When the fan does turn on cold air blows out. It's the push button that seem to have a mind of their own. If they decide to work then everything is fine. The defrost is the only button that seem to work everytime I pushed it. Only the heat and A/C buttons are a problem. I'll check your link and let hubby know (he is the hands on person).
 
  #4  
Old 07-27-02, 08:41 PM
DBinSD
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Just checked the link and no manuals are available for my year BMW.
 
  #5  
Old 07-28-02, 07:46 AM
Joe_F
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I suggest you find a used OEM manual for your BMW, best bet.

Also, you can try the local public library, they will have something. Barring that, a 25 dollar Alldata.com subscription will net you all the wiring diagrams you need for a year.
 
  #6  
Old 07-28-02, 10:37 PM
knuckles
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You might also want to post your question on the7 Series Message Board.
 
  #7  
Old 08-01-02, 09:49 AM
DBinSD
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knuckles

Thanks, I'll post there.
 
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