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      07-03-2012, 09:34 PM   #1
CDN_135i
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Strange loud knocking type noise from engine bay when AC activated

As the title says I am getting some strange loud noises from th engine bay when AC is activated. Do our cars normally produce an audible difference in engine noise when AC is on?

I will post a video probably tomorrow.

Thanks.
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      07-03-2012, 10:13 PM   #2
alvitdk
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Quote:
Originally Posted by CDN_135i View Post
As the title says I am getting some strange loud noises from th engine bay when AC is activated. Do our cars normally produce an audible difference in engine noise when AC is on?

I will post a video probably tomorrow.

Thanks.
Absolutely, the clicking noise you hear is the compressor clutch. sometimes the rpm will go down a bit as well, not much on my bimmer but on all te other cars I had.
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      07-22-2012, 06:56 PM   #3
CDN_135i
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Ok so it definately isnt AC related. I met someone today that says he thinks it's the pilot bearing. Have a listen and let me know what you think.

http://s1153.photobucket.com/albums/...t=4a1ec1bc.mp4

You will notice at the 39s mark or so my wife presses the gas and it goes away until the engine rests at idle again. I also had the clutch stick half way today while driving.

Now here is the thing, the car sat and cooled for a few hours and it went pretty much completely away?????

It goes from sounding like a diesel to back to normal and the only thing I can think of is that after some spirited driving it was worse so im assuming that is a symptom.
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      07-23-2012, 04:43 AM   #4
RimasRS
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Quote:
Originally Posted by CDN_135i View Post
Ok so it definately isnt AC related. I met someone today that says he thinks it's the pilot bearing. Have a listen and let me know what you think.

http://s1153.photobucket.com/albums/...t=4a1ec1bc.mp4

You will notice at the 39s mark or so my wife presses the gas and it goes away until the engine rests at idle again. I also had the clutch stick half way today while driving.

Now here is the thing, the car sat and cooled for a few hours and it went pretty much completely away?????

It goes from sounding like a diesel to back to normal and the only thing I can think of is that after some spirited driving it was worse so im assuming that is a symptom.
If it's only when AC is on. My guess would something is not right with your AC compressor maybe lack of oil and you can hear compressor pistons.
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      07-31-2012, 05:44 PM   #5
CDN_135i
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FYI it was a flywheel dowel pin that was loose.
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