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-   -   My 2004 convertible 330ci is making weird "cricket" noise when ac on (http://forum.e46fanatics.com/showthread.php?t=951596)

Rlp951 10-21-2012 01:39 AM

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 :(

R1200RT 10-21-2012 08:49 AM

My vote is for belt or idler for your AC compressor, also possibly a bearing on the compressor.

vilseck21 10-21-2012 01:51 PM

Could be your blower motor is wearing

Nickvjr 10-23-2012 02:16 AM

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!

Chilton88 10-27-2012 12:14 AM

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?

lucky_doggg7 10-27-2012 04:15 AM


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.

cityjohn 10-27-2012 04:50 AM


Originally Posted by Rlp951 (Post 14832774)
My 2004 convertible 330ci is making weird "cricket" noise when ac on

Check the front passenger seat for DMAX doing his routine

dmax 10-27-2012 07:15 AM

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?

cityjohn 10-27-2012 07:29 AM

Doug to the rescue!


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