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Yolanda, did you only change pulley on the tension er, the tension er arm may be worn and miss aligning belt allowing belt to drift and fall off. I will post some links below of what to check for.
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The Belt Tensioner is probably crooked, it's hard to tell but if you look at it while the vehicle is running and it looks tilted even just a tiny bit, it will cause the belt to fall off. Belt Tensioner.
Check to ensure the Sienna's engine is cold, then make sure
the Sienna is in park, the ignition is in the off position and the key
is removed from the ignition to prevent any possibility of the engine
engaging during the serpentine belt replacement.
Open the hood and locate the serpentine belt routing diagram
sticker on the side of the engine casing. Study it for a moment before
removing the existing belt. It is essential the new belt be installed
exactly as the diagram indicates.
Find the tensioner pulley, the main pulley that controls the
serpentine belt, and fit a 1/2-inch socket wrench over the
self-tensioner on the outside of the pulley.
Pull the wrench to the left to move the pulley forward, which loosens the belt, then remove the belt.
Compare the old serpentine belt with the new, replacement
belt for length, width and number of grooves on the belt's underside. Be
certain the replacement belt is the right part.
Fit the new belt on to each pulley according to the
serpentine belt routing diagram on the manufacturer's sticker, or
according to the drawing made prior to removing the old belt. Fit the
new belt on to the tensioner pulley last, again applying pressure on the
pulley's self-tensioner with the half-inch socket wrench to loosen the
Release the pressure on the self tensioner and allow the
tensioner pulley to ease back into place, thereby tightening the new
serpentine belt with the appropriate tension.
Buy a replacement for about $40 at autozone or advance, if the serpentine belt has never been replaced get one of those too. Jack the front passenger wheel up and put a jackstand under it. Take off the tire and you will see a plastic service door in the wheel well, take that out too. You now see all the guts there. Now get a long wrench put it on the tensioner bolt and use it to relieve tension, pull off the belt, unbolt the tensioner, put the new tensioner in tightening bolts firmly. Put the new belt on, use some leverage on the tensioner to allow you to put the belt on the tensioner and you are done. While you are in there you may want to replace the right side dog bone motor mount which will also be right in front of you.
Hello,Locate the serpentine belt tensioner on the front of the engine.The tensioner is what keeps tension on the belt and keeps the belt from coming off.The tensioner will have a bolt head in the middle of it that a 15mm socket will fit STEP 2:Look on the hood base where the hood lock attaches to the base and see if there is a belt diagram.This diagram will give you the exact instruction for properly routing the belt across the pulleys.If there is no diagram there,you will need to write down the exact routing of the belt on the pulleys on a notepad STEP 3:Put the 15mm socket onto the ratchet and put the ratchet onto the bolt head on the belt tensioner. STEP 4:Turn the tensioner clockwise to relieve the tension on the belt and remove the belt from all of the pulleys STEPS 5:Remove the new serpentine belt the same way that the old one came off by following the belt routing diagram instruction.Do not put the belt across the tensioner until last.Keep in mind that the belt will only go on one way and be right. STEP 6:Put the ratchet with the 15mm socket back on the belt tensioner and rotate the tensioner clockwise to give you enough room to slide the new belt across the belt tensioner pulley.Slide the belt onto the belt tensioner pulley and release the belt tensioner.Look over the belt and double check to make sure that the belt is running across all of the pulleys correctly STEP 7:Crank the car and inspect that the belt is secure and is staying in the grooves on all of the pulleys.