Loud howling noise under hood?

Tiny
WATERFORME48
  • MEMBER
  • 2007 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 84,000 MILES
There is a loud howling noise under hood when I shut fan speed button to off. But noise goes away when switch to ac
Saturday, March 7th, 2015 AT 2:30 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Hi,

Chances are it is related to one of the belt-driven accessories. In this case, I would recommend removing the serpentine belt to see if there is any play in the pulleys. Also, spin one at a time to see if you feel any roughness when turning that may indicate a failing bearing.

I attached the directions for the removal and installation of the belt. As aforementioned, remove the belt and check for possible issues.

Let me know what you find.

Take care,

Joe

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Thursday, March 28th, 2024 AT 8:15 PM

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