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2002 Trailblazer automatic transmission makes a humming noise in front between gears when cold.

Tiny
JANTIZE
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 11,400 MILES
Only when the engine is cold there is a humming sound coming from what sound like near the dash when the trans is beyween shifting gears. When it warms up it goes away, otherwise it drives fine.
Monday, November 28th, 2011 AT 2:44 AM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
How long does it last? There is an electric air pump that works when cold for a short period of time.

Roy
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Monday, November 28th, 2011 AT 2:47 AM
Tiny
JANTIZE
  • MEMBER
  • 5 POSTS
It last just until the engine warms up and it does sound like it could be a pump, I just never noticed it since I am the original owner
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Monday, November 28th, 2011 AT 2:52 AM
Tiny
ASEMASTER6371
  • MECHANIC
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When they get some age on them, they make a lot more noise. Have it checked by a shop to confirm. And get a bid.

Roy
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Monday, November 28th, 2011 AT 2:54 AM
Tiny
JANTIZE
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  • 5 POSTS
Also it has 114,000 miles
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Monday, November 28th, 2011 AT 2:54 AM
Tiny
JANTIZE
  • MEMBER
  • 5 POSTS
So it's an air pump that could be going?
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Monday, November 28th, 2011 AT 2:55 AM
Tiny
ASEMASTER6371
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From your description. Without hearing it in person, it is my best guess.

Roy
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Monday, November 28th, 2011 AT 2:56 AM
Tiny
JANTIZE
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  • 5 POSTS
Thank You
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Monday, November 28th, 2011 AT 2:59 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good luck
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Monday, November 28th, 2011 AT 3:33 AM

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