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A/C is activated, there is a ticking/fluttering noise?

Tiny
SJ5410
  • MEMBER
  • 2009 PONTIAC G8
  • 6.2L
  • V8
  • 2WD
  • AUTOMATIC
  • 65,000 MILES
When the car is turned on with A/C off, there is no noise coming from the engine bay, until A/C is activated, and a ticking/fluttering noise starts to occur. The compressor was switched out a year ago or so and the car still throws out cold air. So, it’s not the problem and when the blower motor is activated without A/C there’s no ticking noise it only happens when A/C is activated, and you press on the gas a little a fluttering starts to happen.
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Tuesday, May 9th, 2023 AT 10:31 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

When the compressor engages, it places a heavy load on the serpentine belt. Check to make sure the belt is tight and in good condition. The added load, if slightly loose, could cause a fluttering sound from the belt.

Also, if it is loud enough to record, do so and upload it for me to hear.

Let me know what you find.

Take care,

Joe
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Tuesday, May 9th, 2023 AT 9:07 PM
Tiny
SJ5410
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  • 2 POSTS
Here’s an audio clip of what it sounds like when I activate the A/C only when it’s on.
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Tuesday, May 9th, 2023 AT 9:51 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

If the belt is in good condition and not ripped or coming apart, that sounds like the compressor itself. Take note if that is where the sound is coming from.

Don't laugh, but you can get an automotive stethoscope at most parts stores for about five dollars. Using it, you can confirm that is where the noise is coming from.

Let me know if that is something you can do.

Take care,

Joe
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Wednesday, May 10th, 2023 AT 7:19 PM

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