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AC Clutch Locked

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New User

Jun 27, 2021, 8:40 PM

Post #1 of 4 (741 views)
AC Clutch Locked Sign In

2009 BMW 335i 3.0L 40k miles.

AC is not working/no cold air but AC compressor appears to have a locked clutch with it always engaged. (front always spinning) regardless of AC on or off.
Is it possible that only the clutch is damaged and that I can replace it without discharging the system?

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 28, 2021, 2:21 AM

Post #2 of 4 (725 views)
Re: AC Clutch Locked Sign In

It's not isolated so discharging it is in order to replace if required,

Hammer Time
Ultimate Carjunky / Moderator
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Jun 28, 2021, 3:21 AM

Post #3 of 4 (719 views)
Re: AC Clutch Locked Sign In

You should really leave this to a professional that's experienced with this system. Your car doesn't even have a clutch. It is controlled through internal valving.

You can do more damage than good messing around with this system.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.


Jul 8, 2021, 7:26 PM

Post #4 of 4 (680 views)
Re: AC Clutch Locked Sign In

Those compressors have a refrigerant control valve (RCV). With only that mileage, I bet that it stopped working. We use an RCV tester to determine whether is good or bad. I hope you find someone who is willing to replace it instead of the whole compressor.

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