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7 Series - E38 (1995 - 2001)

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  #1  
Old 05-14-2013, 03:45 PM
zachiepie zachiepie is offline
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Location: St. George, Utah
 
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Mein Auto: 1997 328is, 2001 750is
A/C high pressure switch not on

Hey guys. As the weather warmed up, I found my A/C isn't working. I found that the high pressure switch isn't even turning on; as it's not powering the compressor, and I can actually jump the compressor into giving me cold air.

Is there a reason why that switch won't activate? I occasionally get a message to check coolant level (level is fine, sensor must be bad), could that turn that switch off? Or maybe there is a reset procedure? I can't even find a schematic. Hmmm. Maybe it's not that different from an e39...
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  #2  
Old 05-14-2013, 08:25 PM
Mayorchuck Mayorchuck is online now
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Location: Farley, MO
 
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Mein Auto: '96 740iL
Refrigerant, ambient temperature and coolant temp can all affect the compressor. My limited experience with that issue was usually low freon. Not sure if the link below will work. Has more detailed info. It's a PDF that give more specifics on the numbers.

http://www.google.com/url?sa=t&rct=j...,d.dmQ&cad=rja
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  #3  
Old 05-15-2013, 07:54 PM
zachiepie zachiepie is offline
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No dice on that link!
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  #4  
Old 05-15-2013, 08:00 PM
Mayorchuck Mayorchuck is online now
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It's a .pdf I have bookmarked. When I click on it it downloads the pdf and opens it. Let me try it a different way.

http://www.bimmerboard.com/members/r...38.pdf***8206;

http://www.bimmerboard.com/members/r...IHKA%20E38.pdf
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  #5  
Old 05-16-2013, 03:13 AM
zachiepie zachiepie is offline
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Ah ok, my Surface Pro opened it. Thanks! While I don't see anything I can immediately use, I'll dig through it. Looks like a ton of good information.
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  #6  
Old 05-16-2013, 05:25 AM
chrisn7 chrisn7 is offline
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Mein Auto: 750iL
If the system is low on gas, the pressure switch will not operate the compressor
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  #7  
Old 05-16-2013, 11:05 AM
zachiepie zachiepie is offline
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High side had plenty of pressure, not sure about the low since the compressor wouldn't turn on unless I jumped it. And when I jumped the compressor, the air blew pretty cold.
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  #8  
Old 05-20-2013, 06:15 PM
zachiepie zachiepie is offline
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Umm so I think I solved it. I turned on the defroster, then hit the snowflake, and the compressor engaged. Weird huh.
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  #9  
Old 06-09-2013, 10:27 AM
zachiepie zachiepie is offline
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So it turns out that the compressor isn't turning on now, even though the snowflake light is bright. Any other ideas?
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