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Check the belt tensioner they squeal when they fail due to constant spring pressure on the pulley> if you replace it I would suggest replaceing the belt unless it is new, check the alternator bearings ( spin it by hand with the belt off> they are known to fail)finally clean all pully and make sure the belt is perfectly clean and nothing on it before installing it. NOTE:Never get any grease on a serp belt it will make noise.
have you checked all of the idler pullys and the tensioner for the serpintine belt take the belt loose and spin the pullys also check the alternator with the belt off
Whistling can be caused by vacuum leaks. look for hoses and tubes to be cracked or broken. The tick may be the sound of the injectors working or valve noise. more info needed.
check the idler/tensioner pully's and the alternator pully, there is a common problem with one of these 3 going bad, usually an idler pully the best way to check is to get a mechanics stethescope and touch the end to the bolt on the idler pully's you will notice a very distinct sound difference from a smooth pully and one with bad bearings. gm tech here, seen many of these
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
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