Does your Toyota Sienna squeal whenever you turn on the air-conditioning or defrost? The most likely cause of the squeaking and also squealing is a worn the end serpentine belt. Follow this photo guide to change the belt.

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I ran right into an issue where whenever ns turned the A/C ~ above in my Sienna, I would certainly hear this according to squealing noise comes from under the hood. That was specifically embarrassing once you would begin the automobile in a parking lot! that turned out that the A/C belt was acquiring old and also brittle, so the wouldn’t fixed the pulleys prefer it should, and instead it would slip now and also then causing the squealing noise.

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I do the efforts spraying part belt dressing top top there, and that aided for number of days, however after about a main the squealing come back. I finally determined to replace the belt, and also that solved the problem.

Maintenance Information

Time:  30 minutesCost:  ~$20 (you’ll save about $150 by doing this yourself)Difficulty: 2 out of 5Hardest part about this repair:Loosening the alternator bolts if they space rusty.Determining exactly how ‘tight’ to make the beltWhat you’ll Need:12mm socket14mm socket

Changing the Serpentine Belt in a Toyota Sienna – Steps:

Loosen bolts hold on the alternatorUnscrew the belt tightening bolt top top alternatorRemove the old beltInstall the new beltRe-tighten the belt-tightening boltTighten the alternator mounting bolts

Alright, the was the review of the steps, let’s go ahead and also get started!

How to replace the Serpentine Belt

This is the procedure for replacing the simple serpentine belt on a 2003-2009 Toyota Sienna v the V6 3.3L engine. The V6 3.5L serpentine belt is slightly different as viewed in the chart below. The car shown here is a 2006 Sienna. You can inspect which engine you have by popping the hood and reading off the big bold letters, as presented below.

Note: the V6 3.5L engine offers a different belt.

Here is a diagram of the belt route for this 3.3L Sienna (top) vs. The 3.5L (bottom):



The 3.3L belt course is lot simpler.

These room the serpentine belt part numbers because that the various engines:

The very first step is to pop the hood and identify where the belt is. It is located on the left side of the engine, attached to the alternator as shown in the next two photos.

Next, loosen the bottom mounting bolt the the alternator making use of a 12 mm socket. You don’t need to take the bolt every the means out, simply loosen it several turns.

Now loosen the upper mounting bolt ~ above the alternator utilizing a 14mm socket. Again, ease the bolt number of turns, however don’t remove it.

We will now release the anxiety on the belt by loosening the tensioner bolt. This bolt is 12mm and also located as presented below. You will should loosen this bolt a lot.

As you can see in the check out below, this tensioner bolt simply pushes against a avoid to press the alternator upward, and thus tighten the belt.

Continue loosening this bolt (counter-clockwise) until the alternator is low enough to eliminate the belt. Depending on how much you loosened the alternator mounting bolts, you may need to push down on the alternator to force it under as you ease the tensioner bolt.

Here the tensioner bolt has been loosened sufficiently because that the old belt to be pulled off of the alternator pulley.

Remove the old belt by pulling it fully off of the alternator pulley, and likewise off that the various other 2 pulleys below.

Once the old belt is turn off the pulleys, line it out and also remove it.

This is the replacement belt (Part#5060410) ns used.

Below is a side-by-side to compare of the v-grooves in the new (left) and also old (right) belts.

The old and new belts reflecting the component number (5060410 and 6PK1040).

The following photo helps provide you a sense of the length of the belts.

Take the brand-new belt and also snake it down into the room where the old belt was.

Get the new belt looped approximately the 2 lower pulleys first, climate stretch it end the alternator pulley. If it is too tight, loosen the tensioner bolt part more.

Once the brand-new belt is on, verify the it is seated appropriately on every 3 pulleys.

Then start tightening the tensioner bolt.

Every couple of turns, check the tension on the belt. Once you push down on the belt between 2 that the pulleys, it should deflect no much more than around 1/2″. If the deflects an ext than that, continue tightening.

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Once you have the correct tightness, protect against adjusting the tensioner bolt and re-tighten the lower alternator mounting bolt through the 12mm socket.