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Air conditioner sound

Tiny
SMITHLA47
  • MEMBER
  • 2005 MINI COOPER
  • 4 CYL
  • FWD
  • 82,000 MILES
I have a 2005 Cooper with a sound coming from the air conditioner unit. Basically, when engaged and at idle, there is a noticable whine above normal engine noise. When proceeding through the gears at speed, the sound increased to a howl-as you gear down, the sound becomes less audible. If the ac is shut down duiring driving, the noise completely disappears.

Any ideas?
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Saturday, July 30th, 2011 AT 11:24 PM

6 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Sounds like you have a bad compressor. You need to have that verified by a competent technician.
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Sunday, July 31st, 2011 AT 12:05 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
You could have a bad bearing in the a/c clutch remove the belt and spin the a/c pulley by hand and listen for that noise.
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Sunday, July 31st, 2011 AT 12:08 AM
Tiny
WRENCHTECH
  • MECHANIC
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I would expect it to be an internal bearing instead of pulley bearing since it disappears when the clutch is disengaged.
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Sunday, July 31st, 2011 AT 12:12 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
If its not the outside then its the inside if you rule out the outside you know its the inside.
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Sunday, July 31st, 2011 AT 12:24 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Wouldn't disengaging the clutch be doing just that? Pulley still turning, noise gone.
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Sunday, July 31st, 2011 AT 12:27 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
There would be more of a load on that outter bearing with the a/c engaged and could only make noise with the a/c on anything is possible. Iam not trying to argue with you iam just trying to help this person fix there car.
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Sunday, July 31st, 2011 AT 12:37 AM

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