Belt replacement 2004 tracker - 2004 Chevrolet Tracker

Question edited for clarity.
Question moved to sub category.

You order them to the vehicle, not by size. The three belts are here with the OEM Parts numbers. Parts suppliers have a book with all the makes, models and years, and that book tells them the length, width and form, (ribbed or plain).
https://www.partsgeek.com/catalog/2004/chevrolet/tracker/drive_belts/accessory_drive_belt.html

You can also pick them up from Walmart, or eBay.

https://www.google.com/search?q=2004+Chevy+Tracker+LT+2.5L+V6%2C+serpentine+belt+size

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Hope this helps

Chevy Tracker 1999 2004 Factory Service Workshop repair manual download

get your car fix right now

How-To Replace The Serpentine Belt On A Chevy Tracker ...

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www.youtube.com/watch?v=sXLTZzEZdSU
Oct 28, 2014 - Uploaded by Deo Ole
How-To Replace The Serpentine Belt On A Chevy Tracker ...2001 Chevy Tracker V6 2.5L Head Instal and Timing Chain Instal - Duration: ... XL 7 2.7L Air conditioning compressor removal and smaller belt installed - Duration:

A seatbelt is considered a critical piece of safety equipment. If it is faulty, replace it. The least expensive option is a junkyard.

GM use a particular item on one of the idlers
there will be a 1/2" square hole in the center of it
use a strong bar and lift the pulley up against a spring
install the new belt and when properly installed let the pulley back onto the belt

It is either bolted in place or it has a spring that can be released with a belt tensioner tool you get at an auto parts store. You might can use a 1/2" brakeover bar.

First be cretin that the belt's are an exact match, sometimes it's a really tight fit, hope you are using a tensioner tool that allows full travel of the tensioner. Often times it is which pulley you are trying to slide the belt over, your best bet is to go for the idler & tensioner pulley because they are not ribbed, thus you don't have to fight with it go over an edge that has a guide.

fan belt is slack, or old and worn, replace

Try this link. While it is not specific to your Tracker, it is a good video step by step overview which will help you a lot.
http://www.wonderhowto.com/how-to/video/how-to-change-a-serpentine-belt-on-your-car-39904/