whirling noise under hood?

2003 TOYOTA 4RUNNER
98,460 MILES • 4.0L • V6 • 4WD • AUTOMATIC
Avatar
TBADALUCCA
  • MEMBER
  • 2 POSTS
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.
Jul 21, 2022 at 11:10 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 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

Jul 21, 2022 at 6:53 PM
Advertisement
Avatar
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.
Jul 22, 2022 at 8:22 AM
Avatar
JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 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
Jul 22, 2022 at 7:22 PM