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Originally Posted by kbsilver
If I'm not mistaken, in the E90 there is no clutch on the A/C compressor, it's designed to run all the time. It has variable output and that is how it regulates cooling amount. When A/C is not needed output is set to near zero. This also keeps the compressor oil circulated in the system keeping seals happy.
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I think you are right cause my buddy said vw/ audi on 2005 and newer went to the clutch less compressor also. I figured it was set up like that too, I just needed someone to co-sign....