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5 Series DIY
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  #1  
Old 07-07-2010, 11:05 AM
Nasir Nasir is offline
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Location: NY
 
Join Date: Jul 2007
Posts: 59
Mein Auto: 2000 528i
Talking AC Makes loud Noise?

Hey guys! Longtime no talk because I had no problem with my 2000 528i.
Now as we have severs hot weather in the East, when I am using AC, it sounds very loud and abnormaly noisy. My son has the same car but it does not make this much noise when his AC operates.
Some one said I may need coolent/oil in the compressor? I have never heard about this. Is it true? Any idea guys?

Last edited by Nasir; 07-07-2010 at 11:11 AM.
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  #2  
Old 07-31-2010, 01:40 PM
Fleetman's Avatar
Fleetman Fleetman is offline
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Location: Thomasville, Pa
 
Join Date: Jul 2010
Posts: 210
Mein Auto: '11 X5 35d & 98 Cherokee
There is probably a good chance it is low on refrigerant. The refrigerant carries the lubricating oil through the system so if there is a refrigerant leak there will also be a resultant oil loss.....both of which will cause a noisy compressor. I suggest not using the ac and have a tech look at it (soon) before the compressor completely fails. As a reminder, the ac compressor will also run anytime "Defrost" is selected. A failed compressor can get expensive to repair as usually you have to replace the compressor, drier, and, most times, the condenser as they are near-impossible to thoroughly clean. Unless you have a very good understanding of refrigeration and possess the proper equipment (gauges, vacuum pump, etc) this is not normally a job for the DIY'er.
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