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1999 Chevy Monte Carlo Vibration air&heat

Tiny
SANDEEGB
  • MEMBER
  • 1999 CHEVROLET MONTE CARLO
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 123,000 MILES
When heat or air conditioning is on, I can hear a vibration noise, even worse when on 3, 4 nob position.
Thursday, June 11th, 2009 AT 10:56 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Is the sound coming from under the dash on the passanger side?
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Sunday, June 21st, 2009 AT 8:11 PM
Tiny
SANDEEGB
  • MEMBER
  • 3 POSTS
I can hear mostly from the vents, something like a vibration noise, but I can can hear noise from the passenger side, kinda like a hum.
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Sunday, June 21st, 2009 AT 10:44 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
The fan is located under the dash on the passanger side. Make sure that it isn't loose. Also, if it is tight, remove it and make sure nothing got stuck in the fan blade.

Let me know what you find.

Joe
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Monday, June 22nd, 2009 AT 10:17 PM
Tiny
SANDEEGB
  • MEMBER
  • 3 POSTS
Strange, where I live, it has been in the high 90's and 100's, hot and high humidity. It has been at least 15-20 degrees cooler, and there is no noise at all. Would the outside temp have something to do with it? The heat and air works just fine.
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Wednesday, July 1st, 2009 AT 9:19 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Maybe the motor is getting too hot. It may be going bad and the higher temps affect it.
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Wednesday, July 1st, 2009 AT 3:51 PM

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