Question about 2006 Chevrolet Trailblazer Ext

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Whining humming noise under hood

When start trailblazer constant humming/whining noise comes from large black "container" under hood & same noise transfers out to fan. Engine light stays on most the time (for 3 years)& no problems (was told thermo get stuck open which is ok- just so does not stick closed) just recent started hearing a slight humming as I drive (no worse when make turns)then oil light came on...was little low on oil...filled it--however oil light stays on longer (15 sec.)than should when start up--but goes off...engine light still stays on...don't think it's gone off since noise started...noise has gotten louder...NO pings, No backfires just solid "whhhiiyyyy" sound. not as loud when at light stopped--but still hear it!! Also all gauges on dash are normal--any idea? Help!! I'm job hunting & worried it might stop on me...

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  • lorna ffler
    lorna ffler Apr 16, 2014

    okay I need to add it's a 2005 NOT 2006...if that matters :)

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  • 12 Answers

If the engine is not reaching optimum operating temperature it will indeed give you a "check engine light",the code will lean you in that direction as well.The noise your hearing more than likely is coming from the "clutch fan",they are very common on the TrailBlazers to make noise and fail.The oil light... you certainly need to have the oil pressure checked with a mechanical gage.

Posted on Apr 15, 2014

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  • 241 Answers

I would strongly suggest you pop into your local Garage and get someone to have a quick look over. There will be a cost involved, but that could be much cheaper than a break down.
Ps...dont ask friends, they will guess ..which will cost you even more.
Cheers
Roger

Posted on Apr 15, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 45 Answers

SOURCE: Chevy Trailblazer Engine very loud when starting

it's too early to tell. i,ve never known a light to come on because of a thermostat.you need to see what code was stored. without knowing,im just guessing. but my first thought was a plugged up catalytic converter. that explains the low power,also fuel filter.

Posted on Apr 29, 2009

  • 22 Answers

SOURCE: Runs Ok...engine warmed up...come to red light or

Sounds to me like the Throttle Position Sensor. Thats usually what makes the throttle "rev" But that is not going to make the oil pressure drop. Pull the codes from your car and look them up online. sometimes there is an extra fuse u can add to your panel and turn the key on and it will flash your codes via the check engine light. i.e. if the light flashes 2 times then small pause then 1 time and long pause that is code 21. if there isnt a extra fuse you can usually jump it with a paperclip and pull the codes. not really sure how to do that with yours. but im positive Google knows ;)

Posted on Oct 20, 2009

Molson02536
  • 3854 Answers

SOURCE: 1999 chevy suberban. it will turn over but wont

There is a good chance that your ignition keys need to be replaced, you can pick up a replacement ignition lock switch at Auto Zone and they will have the step by step instructions to getting the job done.

Thank you for using fixya and good luck

Posted on May 08, 2010

Crew Dawg
  • 275 Answers

SOURCE: My 2001 Silverado 1500 Extended

Belts, Idler pulleys, tentioner pulleys, and alternators are usually the culprits of "whirr" noises.
May have to raise hood and listen to where its coming from a little better.

Ive given possibilities from least expensive to most...

Hope this helps...

Posted on Aug 27, 2011

  • 344 Answers

SOURCE: my 2006 trailblazer's oil pressure gauge just started dropping to 0 during driving...when I stop and kill the engine then restart it, the gauge goes back to normal. Any Ideas?

The oil sensor sending unit is shot,

Posted on Nov 29, 2012

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