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E46 Convertible
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Old 10-21-2012, 12:39 AM   #1
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My 2004 convertible 330ci is making weird "cricket" noise when ac on

My car chirps when not moving either ac on or off, the higher the ac, the loder the chirp, any opinions to what it is? Please help, im goin crazy, short on cash for mechanic

Last edited by Rlp951; 10-21-2012 at 02:06 AM.
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Old 10-21-2012, 07:49 AM   #2
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My vote is for belt or idler for your AC compressor, also possibly a bearing on the compressor.

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Old 10-21-2012, 12:51 PM   #3
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Could be your blower motor is wearing
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Old 10-23-2012, 01:16 AM   #4
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My vote is for the blower motor going out / bearings squeaking.

Here is why... A change in AC Blower speed changes the chirp which means the 'blower motor'. If it was the belts or AC Clutch then the force of the air blowing into the cabin wouldn't change the pitch of the chirp cause the belts & clutches spin at RPM speed not blower motor speed.

There is a great DIY on blower motor replacement! Good Luck!
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Old 10-26-2012, 11:14 PM   #5
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How come if I turn up the fan and keep the a/c off, the noise goes away. It is only occurring when the a/c is on -). Also when I turn on the a/c there is a growling noise. Is it the compressor?
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Old 10-27-2012, 03:15 AM   #6
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There is an ECU fan right above the footrest; it's making a chirping sound to indicate that the useful life of the fan is coming to an end. To verify, get down in driver footwell, after you adjust the seat fully back; pull the carpeting back for better viewing just to make sure and listen for the little birdie (chirping sound). This is a well documented issue with the M3 also, so don't feel singled out. See the attached post.
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Old 10-27-2012, 03:50 AM   #7
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Originally Posted by Rlp951 View Post
My 2004 convertible 330ci is making weird "cricket" noise when ac on
Check the front passenger seat for DMAX doing his routine
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Old 10-27-2012, 06:15 AM   #8
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If you're lucky, dmax will have his hose with him and help you isolate the source of your chirping...he'd probably check AC compressor first if I know him. He's not that funny...so you're better with his hose, if you know what I mean?
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Old 10-27-2012, 06:29 AM   #9
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Doug to the rescue!

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