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Noise when A/C is on

Tiny
PSYCO
  • MEMBER
  • 2001 CHEVROLET TAHOE
  • 90,000 MILES
When I first turn on car- there's a shoosh noice. This noise happens frequently when I have the a/c on. The air is cold but I get a noise that sounds like it's releasing air. Any ideas?
Friday, September 2nd, 2011 AT 12:28 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
Check to make sure the coolant is full. You may hear it filling the heater core.
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Friday, September 2nd, 2011 AT 12:47 AM
Tiny
PSYCO
  • MEMBER
  • 2 POSTS
Coolant is full. The noise sounds as if air is being released for 5 seconds-then another release noise for 2 secs. Very strange
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Friday, September 2nd, 2011 AT 8:51 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,650 POSTS
That's interesting. The only thing I can think of without being there is to check for vacuum leaks under the dash. The vent doors are actuated by vacuum. Maybe there is a leak.
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Saturday, September 3rd, 2011 AT 3:44 AM

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