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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > a/c compressor



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      08-15-2016, 03:06 PM   #1
32valves
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a/c compressor

I noticed my a/c clutch is still engaged when my a/c is off. Meaning a/c off and the compressor hub is still spinning with the pulley. Anyone else notice this or just my clutch shit the bed?
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      08-15-2016, 08:29 PM   #2
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Quote:
Originally Posted by 32valves View Post
I noticed my a/c clutch is still engaged when my a/c is off. Meaning a/c off and the compressor hub is still spinning with the pulley. Anyone else notice this or just my clutch shit the bed?
Typically, there is a clutch cycling switch (not sure what BMW calls it). However, it sounds like yours is stuck. Should be easy to find in RealOEM.
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      08-15-2016, 08:47 PM   #3
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#11 below in the attached. This will require the A/C to be evacuated and refilled.

Could also be a relay (easy to check) or the on off switch.

Does the compressor cycle off and on while operating? or does it never disengage?
335dAC.pdf
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      08-16-2016, 03:11 AM   #4
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I'm guessing it's stuck on/ engaged.
I will have to dig in it this weekend.
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      08-16-2016, 04:51 AM   #5
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Originally Posted by 32valves View Post
I'm guessing it's stuck on/ engaged.
I will have to dig in it this weekend.
When you do see if the compressor is cycling on and off during operation. It should engage and disengage as it goes through the operation. If it does, then it's not the pressure switch.
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      08-16-2016, 07:31 AM   #6
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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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      08-16-2016, 10:56 AM   #7
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Quote:
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.
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....
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      08-16-2016, 07:07 PM   #8
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Quote:
Originally Posted by kbsilver View Post
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.
Partially correct.....

If you have the S1CBA Package "CO2 Package", then you have a clutchless compressor. Otherwise, you have a compressor with a magnetic clutch.

However, I don't know exactly what this package is...and don't even know which compressor I have. I'll try to confirm what I have.
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