I am trying to replace the serpentine belt on a 2001 Chevy Tracker and I need a detailed diagram to tell me how to identify the tention wheel and what I need to do in order to release the tention wheel and install the correct belt.

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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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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:

do not remove the fan. you have a automatic belt tensioner. look for small pulley to passenger side of fan. pulley will be attached tp leaver which is the tentioner. on the leaver in a 3/8 dive hole in it so you can attach a ratchet or braker bar in . once you in mount ratchet push or pull on ratchet to release tention hold back on tentioner and take belt off pay close attention to how the belt is routed.

http://www.2carpros.com/diagrams/geo/tracker/2002

You mean your belt tentioner, serpentine belt, it is not adjustable if your belt is coming off you have a bad tentioner, bad pulley or your power stering pump is leaken and your belt is soaked, if oilly firts found your leak (most common is a hose from reservoir to pump) then replace belt with a cheap belt (had lost of trouble with Life time or hi dollar belts), in the mean time also inspect your tentioner if ani play side ways replace it, also remove idle pulley and spun it close to your ear, if any noise replace it, you may get away with a single item changed, but for trouble free time, replace all items: belt tentioner ($38) idle pulley($25) serpentine belt ($25)

For the 2000 Chevrolet Tracker:

Most modern vehicles have the Belt Routing Diagrams on the undeside of the Hood. But the sometimes disappear.

I do not know if you have the 1.6L In-Line 4-Cylinder, or the 2.0L DOHC In-Line 4-Cylinder. Nor what Engine Options you have (AC/No AC, etc.).

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

http://www.2carpros.com/car_repair_information/year/2000/make/chevrolet/model/tracker/2000_chevrolet_tracker_drive_belt_routing_diagram.htm

First, keep this diagram around as you will need it to route the serpentine belt when you reinstall it. There may also be a diagram under the hood by the radiator.
Next, follow this link and watch the video that shows you how to replace a serpentine belt...
http://www.wonderhowto.com/how-to/video/how-to-inspect-and-replace-your-car-s-serpentine-belt-267229/

With AC, I hope.

call your local autozone and the will tell you over the phone or fax you a copy

the tentioner is above the alternator