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When accelerating it sounds like an airplane taking off

Tiny
JEFFREY ALAN JAMES
  • MEMBER
  • 1996 CHEVROLET ASTRO
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Replaced water pump and fan clutch.
Sunday, October 6th, 2019 AT 1:07 PM

8 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

This is normally the fan itself and not necessarily a bearing. Normally, it is because the clutch has failed and it locks the fan in "high" and it roars at slower speeds.

If this is replaced and it still does it, then we need to turn to a bearing. Does the noise happen when in Neutral and reving the engine or do you have to be moving?

If none of these items in this guide sound close then maybe getting a recording of the noise is the best bet.

https://www.2carpros.com/articles/whirring-sound
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Sunday, October 6th, 2019 AT 5:39 PM
Tiny
JEFFREY ALAN JAMES
  • MEMBER
  • 6 POSTS
Only when moving.
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Monday, October 7th, 2019 AT 12:59 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Have you checked the fan blades for cracked blades? The increased air flow will make the noise louder. I am wondering if the fan itself is the issue.
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Monday, October 7th, 2019 AT 7:03 PM
Tiny
JEFFREY ALAN JAMES
  • MEMBER
  • 6 POSTS
It revs up real high every time I accelerate. Not when idling only when moving.
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+2
Friday, October 18th, 2019 AT 2:31 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Is it loud enough to get a recording of it? Maybe hearing it will get us on the same page. Thanks
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Friday, October 18th, 2019 AT 5:24 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Can you please shoot a quick video with your phone so we can hear the noise? That would be great. You can upload it here with your response.
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Saturday, October 19th, 2019 AT 10:46 AM
Tiny
JEFFREY ALAN JAMES
  • MEMBER
  • 6 POSTS
It's leaking now from same area like new water pump is leaking.
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Monday, October 21st, 2019 AT 7:53 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Is the water pump making the noise? Try to move the clutch fan by hand to check the "free wheel" part. It should move but with resistance.
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Tuesday, October 22nd, 2019 AT 11:32 AM

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