N54 Air Compressor Pulley, Trying to Source

[Codes2]

Hi all,

I've been digging for days without luck, so thought I'd write here.
Has anyone found the Pulley (with electromagnetic clutch) for the Air Conditioning Compressor?

Per RealOEM.com, there is 1 PN for the Compressor and it comes with the Pulley. Pricey when it's just a Pulley issue.

I've read through a few forums, googled and watch youtube videos without luck for this model. (2008 335i, N54, E9x)

Thanks for any help!!

[vilcan.alex98]

Hey, i have some problem too with A/C , my does some noise , like something without oil , i don't know how to explain that, but is doing noise , i was at mechanic and he say to me : is bearing problem , our A/C is without cluch as i know , so pulley work all time . This bearing is 9 € and he can be changed , how ... i don't know yet. I'm waiting for summer to change it , is not a big noise , a little I can hear that just when i'm in front on my car ( M47, e90, 2006) . I hope it help you
P.S : I watched everywhere without luck too.
And the mechanic who I mention repair just bmw's. So i think he know about that problem.

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[relative4]

Hi all,

I've been digging for days without luck, so thought I'd write here.
Has anyone found the Pulley (with electromagnetic clutch) for the Air Conditioning Compressor?

Per RealOEM.com, there is 1 PN for the Compressor and it comes with the Pulley. Pricey when it's just a Pulley issue.

I've read through a few forums, googled and watch youtube videos without luck for this model. (2008 335i, N54, E9x)

Thanks for any help!!

E90s don't use a clutched compressor. What exactly is your problem?

[jclausen]

Exactly

[Codes2]

E90s don't use a clutched compressor. What exactly is your problem?

First, Thanks all for the feedback.

Truth be told, I'm trying to determine if there is a problem, however I have little data on the A/C Pulley.

History: I shredded my serpentine belt after doing about 5 back to back flat out pulls (testing some new installs).

Objective: Find all (even potentially) contributing factors.

- Crank Pulley seal is OK, so no belt in engine.
- Alternator Pulley Clutch was seized (is supposed to be one-way, as the new one is). Special tool to remove stripped the 12 splines, so replaced entire alternator (was original).
- Power Steering Pulley is OK and is not hitting the frame (and no bolts loose) when engine is under full torque (engine mounts appear OK)
- Idler Pulleys all spin freely
- Tensioner is strong

It's possible it was strictly the Alternator Pulley Clutch that caused the belt to jump when slamming gears (forced instant RPM drop from 7000 to 4500~ and the alternator momentum w/ no free-wheel clutch would have pulled tighter on one side of the belt and created a small slack on the other side until the alternator dropped to match the RMP (likely 200 to 700 ms, though I really don't know)).

In turning the Air Compressor Pulley it feels like the motor inside is turning too.
I speculated (haven't yet found definitive information) that it should be free from the motor until the A/C is turned on.
Much of what I read suggest there is an electromagnetic clutch that engages when the A/C is on.

Should I expect the A/C Pulley to be turning the pump? (it is not bearing resistance in my case, and not lumpy, just a smooth resistance in both directions)

I'm very open to being schooled here

[relative4]

https://www.bimmerforums.com/forum/s...0-A-C-Question

[Codes2]

Thanks relative4

Based on this - I think the Clutch parts that I see in the pictures of the A/C Pulley have nothing to do with the Stop/Start of the compressor, but rather are the equivalent to the one 1-way clutch in the Alternator Pulley, allowing the compressor to turn at a different rate than the belt briefly when the RPM drops instantly from 7000 to 4500~ when racing. (allows the compressor to spin down to the speed of the belt during a sudden speed change)

This image is based on the Real OEM PN 64526956719