Need to know how to change a drive belt. - 2002 GMC Envoy

Jermaun, ensure you have proper size belt, and if it is a directional belt, it has to be installed with arrows pointing in the direction of engine pulley rotation. Watch the links below and do not pinch your fingers. Good Luck.
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Go to the following link and the first photo shows the belt routing. I hope this helps as I know changing the belts on these vehicles can be a major pain in the neck.
Pelican Mercedes Benz Tech Article Mercedes Benz Drive Belt Replacement...

The tension-er pulley will have a 3/8 square drive indentation on the face of the pulley, The pulley is spring loaded and requires a serpentine belt tool or sometimes a 3/8 drive breaker bar will suffice

how do i change my sepentine belt/aternator belt on my astra mark 4. need to know how to get it off???

take a wrench to the drive belt tensor which is a spring loaded pulley off center from the belt path. this is what provides the tension on the belt.

hi on your year it should be changed every90,000 mils i would advise changing the water pump at the same time please rate this answer thanks

you have a serpentine belt, which is one belt drives all, so the routing of this belt is very specific also it matters whether or not you have a/c. Locate your belt routing chart under the hood before beginning. There is a tensioner pulley mounted on a spring arm, the spring arm should have a square drive hole in it, either 3/8" or 1/2" drive size you will need a ratchet of the proper size to insert into this square hole. Using the ratchet move the tension arm (away from belt) to loosen the belt and remove, route and install the new belt and move tensioner the same way place the belt over it and release. Hope this helps, let me know

Tell you what... No response, then I can't help. If you're talking about the accessory drive belt tensioner pully, there are two 12mm bolts which mount it to the engine. You'll need a 3/8's drive ratchet (or other 3/8's drive device) to release the tension so you can remove the accy drive belt to facilitate removal of the tensioner pully. Once you're remove the accy drive belt, remove the two (2) 12mm bolts holding the tensioner pully to the engine (make visual note of position/direction of the drive belt when you do this because you'll need to position the drive belt in the same orientation when you install a new auto-tensioner in place of the old one.).

it's metric. Do you have 2.3L 4 cylinder, 3.0L 6 cyl or 4.0L 6 cyl?

Drive Belt Tensioner, Automatic Removal and Installation

1. Remove drive belt (8620) as described in this section.

1. Remove drive belt tensioner retainer bolt and drive belt tensioner (6B209) .

1. To install, reverse removal procedure. Tighten drive belt tensioner retainer bolt to 83 Nm (62 lb-ft).

Auto Zone has an online manual showing how to do the timing belt here, and for the drive belts here (about halfway down the page).