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1998 Nissan Altima Hissing Sound

Tiny
GALLOWS27
  • MEMBER
  • 1998 NISSAN ALTIMA
  • 4 CYL
  • 2WD
  • MANUAL
  • 122,000 MILES
I have noticed that when I turn on heater or A/C. The moment I turn the dial up to increase air flow (left hand dial 1 thru 4) a short hissing sound can be heard from the undercarriage of my vehicle. In warmer weather it happens much more frequently and sometimes during acceleration. I do lose engine power, but very much. I was thinking that a valve needs to be replaced, but would like to have a starting point.
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Saturday, December 15th, 2007 AT 12:44 AM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Hi there,

This will more than likely be a vacuum leak, you will have to check around the engine for vacuum hoses that may be loose, split or disconnected.

Mark (mhpautos)
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Saturday, December 15th, 2007 AT 1:47 AM

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