WHAT AUSES THE A/C MAKE A LOUD HUMMING SOUND ONLY ON HIGH SPEED

  • Tiny
  • billmill5050
  • 2002 Pontiac Firebird
  • 77,000 miles

A/c set at coldest has 4 speeds no noise but just on 4th speed

Sunday, May 20th, 2012 AT 12:27 AM

14 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,243 posts

If the loud humming noise is coming from the blower fan motor then sounds like you have a bad bearing in the motor etc.

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Sunday, May 20th, 2012 AT 12:44 AM
  • Tiny
  • billmill5050
  • Member

It only does it on high not on low or med

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Sunday, May 20th, 2012 AT 7:07 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,243 posts

Have you dropped the motor and checked the squriel cage for leaves debris etc?

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Sunday, May 20th, 2012 AT 7:10 AM
  • Tiny
  • billmill5050
  • Member

No where is it under dash

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Sunday, May 20th, 2012 AT 9:15 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,243 posts

There you go.

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Sunday, May 20th, 2012 AT 10:14 PM
  • Tiny
  • billmill5050
  • Member

I took off the glove box to get to the motor but I dont know what it is but its in front of the heater core when I masshed it the humming sound quits any idea what it is I posted pic what it looks like

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Friday, July 13th, 2012 AT 8:18 PM
  • Tiny
  • billmill5050
  • Member

Another pic

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Friday, July 13th, 2012 AT 8:24 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,243 posts

Thats a bad pic can you take a actual pic of it and post it or email it to me?

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Friday, July 13th, 2012 AT 8:28 PM
  • Tiny
  • billmill5050
  • Member

Ok ill post if not where do iu e-mail u?

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Friday, July 13th, 2012 AT 8:58 PM
  • Tiny
  • billmill5050
  • Member

3 more

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Friday, July 13th, 2012 AT 10:25 PM

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