Whistling noise when accelerating with the A/C on

2010 SUBARU IMPREZA
75,300 MILES • 2.5L • 4WD • AUTOMATIC
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HANNAHCMERSON
  • MEMBER
  • 1 POST
There's a really annoying noise that accompanies my engine noise while accelerating with A/C on. The noise almost sounds like someone blowing through a straw. It doesn’t happen every time I drive with the A/C on. But it sounded when I left my A/C running for about 20 minutes and started driving.
Jul 2, 2022 at 1:25 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

As the temperature under the hood of the vehicle increases, pressure on the A/C system increases and it isn't uncommon for the compressor to make noise.

Does it seem to only happen when extremely hot or after sitting idle for an extended period which would increase the under-hood temperature?

Also, is it loud enough to record and upload for me to hear? It may help me pinpoint what is happening.

Let me know.

Joe
Jul 2, 2022 at 10:05 PM
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