it is your idler pulley. get it from dealer comes with bracket, just use pulley off bracket. take your belt off and your idler pulley is lower right hand side(facing your engine). 15mm bolt, replace pulley and reinstall your belt. it;s a common problem on trailblazers
SOURCE: air conditioner and heater makes loud noise when turned on.
This might be the noise problem in your blower.The blower is out of balance with this added weight.
SOURCE: silverado 4.8 liter engine makes a whining noise.
Back pressure from a clogged catalytic converter can also cause this problem.
SOURCE: 1996 Chevy Lumina Sedan Whining noise from engine
The pattern you describe is consistent with an alternator going bad. Maybe the fields are already rubbing together. Test it this way: Start the car and leave on idle, when the whine is worse, then start using up electricity, by increasing the demand. Turn on AC, then lights, then full blower and then high beams. If there is a change in the whine, then either alternator or voltage regulator is the culprit. When a compressor pulley bearing is bad, noise shifts just by turning AC on and off.
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