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

2002 CHEVROLET TRAILBLAZER
11,400 MILES
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JANTIZE
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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.
Nov 28, 2011 at 2:44 AM
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ASEMASTER6371
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how long does it last?? there is an electric air pump that works when cold for a short period of time.

Roy
Nov 28, 2011 at 2:47 AM
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JANTIZE
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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
Nov 28, 2011 at 2:52 AM
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ASEMASTER6371
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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
Nov 28, 2011 at 2:54 AM
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JANTIZE
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Also it has 114,000 miles
Nov 28, 2011 at 2:54 AM
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JANTIZE
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So it's an air pump that could be going?
Nov 28, 2011 at 2:55 AM
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ASEMASTER6371
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from your description. without hearing it in person, it is my best guess.

Roy
Nov 28, 2011 at 2:56 AM
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JANTIZE
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Thank You
Nov 28, 2011 at 2:59 AM
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ASEMASTER6371
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good luck
Nov 28, 2011 at 3:33 AM