I changed the alternator on my 99 alero an now it makes a loud sweeking niose is there a way to tighten the belt

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images for diagram on how to replace a serpentine
How To Install Replace Serpentine Belt Oldsmobile Alero 99 ...? 3:33https://www.youtube.com/watch?v=jkzXTt43uwwFeb 9, 2012 - Uploaded by 1A Auto PartsHow To Install Replace Serpentine Belt Oldsmobile Alero 99-04 2.4L .... There should be a belt routing diagram on the frame rail or under side ...serpentine belt install 3.1/ 3.4 v6 - YouTube? 4:00https://www.youtube.com/watch?v=GYoWuvEZ2DcMay 6, 2013 - Uploaded by JoeTheAutoGuythis a serpentine belt install video on a 3.1 liter gm v6 , 3.4 liters are the same in ... Replacing the alternator or serpentine on anyOldsmobile Alero 99-04 3.4 Liter ... Serpentine Belt Replacement 1995-2005 Chevrolet Cavalier .

Belts squeal. Tensioner pulley makes that sound. I think?Trrr?

may just be your tensioner squeeling

First to get right fan belt you tell folks at parts store year, make & model & engine size and they look it up for you. To change belt depending in which belt you have to loosen alternator, power steering pump etc... bolts and slop old belt off new one on and retighten. (Parts folks can show you how also) If you have a bad head gasket, they need to be replaced not tightened.

Try some bar soap on the belt before you start it for the squeal it is the alternator pulley or bearing. The alternator is trying to recharge the power back in to the battery that you used to start the car. So the belt slips on the pulley.

you call it the serpentine belt, we call it the fanbelt.it,needs tightening,slightly loosen the alternator, then pull away from engine and tighten belt, tight enough when you can move longest part of the belt, between pulleys, 1/2 inch in/out.
if squeel re occurs fit new belt.

Sounds like the belt, you're right on track. Check the belt(s) and replace if neccesary. If belts are fine, check for tightness. Should be about a 1/4" flexibility when you push down on them. If all is ok, belt dressing should take care of the problem.
Now, if for some reason, one of the components that run off the belts may be going bad, specifically a/c compressor. If it's starting to lock up, it will make your belt squeal and finally snap.

yes it is the serpentine belt and there is only one and you need to make sure it is on properly and that it is on the idle tensioner pully andd you have to loosen the tensioner to put the belt on and tighten it to tighten the belt look for a belt schematic on the engine compartment area of your car near the front or sodes on the upper outer area where the hood comes opver the comparment

most likely your alternator, when it is cold and you start the alternator needs to recharge a heavy discharge, bearings or slip ring worn. also check the drive belt for wear,

sounds like your altonator belt is loose and needs tightened. if you put a new belt on with the altonator it just needs re adjusted..