7 drive belt pulleys on my 2007 Sienna

[mileena]

I counted a total of seven where my serpentine belt is on my Sienna. Does anyone know what these are for?

I had five pulleys on my old Chevy Cavalier:

1. water pump
2. alternator
3. power steering
4. crankshaft
5. belt tensioner/adjuster

So I assume I have these five for my Sienna too. I also have air conditioning on the Sienna, so one pulley is for that. That makes a total of six.

What is the other one for?

Thanks!

[dandaman]

I don't know the 3.5 but based on that list I would guess an idler.

[mileena]

Hmmm, is that the same as the belt tensioner? I want to check a good manual, but I am scared to order one online that comes in PDF format since you never know beforehand if it is the genuine manual Toyota techs use or a fake. I used to use Chilton's and Haynes, but they wrong a lot.

[dandaman]

An idler is not the same as a tensioner. An idler is a fixed pulley that is used for belt routing only. You can have both a tensioner and one or more idlers, it just depends on the belt setup.