Having problems with your 2006 Chevrolet Trailblazer ?

So i took my 2006 trailblazer to AutoZone and he tells me its the bearings in the Alternator. I am now in the middle of changing the Alternator and got stuck cause the Coolant Hose is blocking the bottom bolt from coming out. I got here to see if it's a good idea to take the hose off or not but then I read everyone's post and they are saying it's not the Alternator it's the Idler Pulley. So confused. I have the same constant whining noise when I drive or when I'm idleing so what part needs to

Posted / edited by AnonymousUser on : 11-12-2017

Answers :

If it is the idler pulley you can verify this by spraying something like WD40 into the center of the pulley and then see is the pitch or noise changes. If it does then you know it is that pulley. If it is the pulley on the Alternator, ie if it makes a chirping noise that gets worse if you kick the AC on or spray water on the pulleys it is most likely a bad belt. As far as removing the Radiator line to get to the Alternator is concerned. That is your choice. If it makes doing the job easier I would remove it. Just make sure you top off the radiator system before you run the vehicle too long. Fact is, once you get the Alternator out you can have it tested in Auto Zone. If it is the Alternator bearing it is going to make the same noise on that test that it made running in your vehicle. If it doesn't make that noise during the test replace the belt for it and double check that pulley that maintains tension. A chirping noise that progresses to a constant squeal is a slipping belt. Easily identified by applying belt dressing to the belt and checking to see if that effects pitch or intensity of the noise.
Get a long screwdriver or some kind of thin rod, put one end on the alternator then put your ear on the other end, do the same to the pulley if there is room, be careful not slip on the pulleys.
\015\012 Whichever one is the loudest, is the culprit.
Repair Help & Product Troubleshooting for 2006 Chevrolet Trailblazer

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