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2005 GMC C1500 Noise

Tiny
U00CXK5
  • MEMBER
  • 2005 GMC C1500
  • V8
  • 4WD
  • AUTOMATIC
  • 65,000 MILES
With the A/C on we get a hissing type noise that stops when reducing speed, but does not go away.

A repair garage told us it was possibley a problem with the hoses. The unit kools ok, they said it would cost about $400. To fix but wouldn't warranty that it would fix the problem.
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Friday, June 26th, 2009 AT 12:04 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Where is the noise coming from? Have they explained what they are fixing? A hissing sound usually indicated a vacuum leak. THat is why I am asking where the sound comes from.
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Wednesday, July 1st, 2009 AT 9:22 PM
Tiny
U00CXK5
  • MEMBER
  • 2 POSTS
They don't know where it is coming from, the garage said they read of a problem with the A/C lines being to close together.

Is it very costly or hard to find a vacum leak when the noise only happens when increasing speed?
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Saturday, July 4th, 2009 AT 8:14 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
I understand. That would make it hard to find. I really question their recommendation. I never heard of that. I'm not sure why hoses running close together would cause a hissing noise.
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Saturday, July 4th, 2009 AT 11:21 AM

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