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.
Sounds like you have a bad compressor. You need to have that verified by a competent technician.
July, 31, 2011 AT 12:08 AM
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.
July, 31, 2011 AT 12:12 AM
I would expect it to be an internal bearing instead of pulley bearing since it disappears when the clutch is disengaged.
July, 31, 2011 AT 12:24 AM
If its not the outside then its the inside if you rule out the outside you know its the inside.
July, 31, 2011 AT 12:27 AM
Wouldn't disengaging the clutch be doing just that? Pulley still turning, noise gone.
July, 31, 2011 AT 12:37 AM
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.