The belt is probably glazed. Clean all the pulleys and replace the belt. Do not use a belt conditioner on a serpentine style belt.
It is not like a belt and pulley. A timing belt is a belt and it fits on a pulley.
I the belt looks good, use some belt dressing and start car again. if squeal stops, belt is loose, so replace tensioner. If it still squeals, could be a bearing on any pulley, then you will have to isolate with a mechanic stethoscope or try wd40 on each one by one. If it improves, you found the culprit.
Chances are if the belt is routed around the pulleys correctly and there is still too much play, then you will need to replace the idler pulley aka tensioner pulley. First I would try replacing the belt to rule out that the slack is due to a stretching, but chances are if the idler pulley is proper it should still take the slack out.
the pulley is bad when it stops moving
If you are referring to the Serpentine belt, you loosen no pulley. You simply remove tension from the belt. The tension is applied by the Idler Pulley. Pry the idler back and remove the belt.If you are referring to the Serpentine belt, you loosen no pulley. You simply remove tension from the belt. The tension is applied by the Idler Pulley. Pry the idler back and remove the belt.
Loosen the tensioner pulley. Put the belt around the alternator pulley and the tensioner pulley. Move the tensioner pulley to the right until the belt is tight. Tighten the tensioner pulley.
You can change the serpentine belt on your Chevrolet trailblazer, by loosening the tensioner pulley. With the loosened tensioner pulley the belt will come off easily. Tighten the new belt with the tensioner pulley.
You must back out three bolts which hold plastic cover over left side spindle pulley first. After cover is removed (or at least two rear bolts are removed allowing cover to be pulled up ) work belt onto this pulley and reinstall bolts on cover. Then, you must loosen idler pulley next to pulley you just placed belt on as to thread belt onto idler pulley which has a metal fence mounted on pulley shaft to keep belt on this idler. Belt must then be threaded around on/off pulley and right spindle pulley and drive pulley.
the belt is worn and loose change the belt and tension properly
should be a sticker on fan shroud Alternator, idler pulley, power steering, a/c, tensioner pulley, crankshaft pulley, water pump this is the order cant upload the picture but when placing the belt on if the pulley has the grooves in it the grooved side of the belt should face the pulley and if the pulley is smooth then the back of the belt faces the pulley
It would depend on what you want to use the belt and pulley for
Loosen the tensioner pulley. When the tensioner pulley is loose the belt will come off. Put the new belt on and tighten the tensioner pulley.