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Whirling noise under hood?

Tiny
TBADALUCCA
  • MEMBER
  • 2003 TOYOTA 4RUNNER
  • 4.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 98,460 MILES
When starting truck I get a whirling noise up front under the hood around the fan shroud, lasts for a couple of minutes and stops.
Thursday, July 21st, 2022 AT 11:10 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

Nothing to worry about. That is the fan clutch. When the temperature under the hood reaches a specific temperature, it fully engages and sounds like a jet engine. Once it cools off a bit, the fan slows down.

Also, I've seen them do this even when the vehicle is cold. I wouldn't be concerned unless it does it all the time.

Let me know if it does sound like a jet engine when you hear it.

Take care,

Joe
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Thursday, July 21st, 2022 AT 6:53 PM
Tiny
TBADALUCCA
  • MEMBER
  • 2 POSTS
Joe, thank you so much for your assistance, it's such a relief, the noise sounds just like a jet engine for a short time then stops. Have a great weekend. Tony B.
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Friday, July 22nd, 2022 AT 8:22 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Tony,

You are very welcome. That's what it is. If it gets to a point that it stays on all the time even when it's cold out, then the fan clutch should be replaced. At this point, I wouldn't worry. My truck does the exact same thing. LOL

Take care and you too have a good weekend. Please feel free to come back anytime in the future if you have questions. You are always welcome.

Joe
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Friday, July 22nd, 2022 AT 7:22 PM

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