How do I change a serpentine belt on a 2001 Chevy malibu?

Question edited for clarity.
Question moved to model category.

Lots of diagrams especially on the images tab.

https://www.google.com/search?q=2012+chevy+malibu+serpentine+belt+diagram

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google 2013 chevy malibu 2.4 eco serpentine belt diagram
should be diagram under hood.
https://www.cargurus.com/Cars/Discussion-c23264_ds1151168

https://www.manualslib.com/manual/877888/Chevrolet-2013-Malibu.html?page=392

follow this link for a video for the entire process
How To Install Replace Serpentine Belt Chevy Malibu 97 03 1AAuto com

Make sure that the belt is fully seated in ALL pulleys, if it still slips off, then you have a pully that is bent, or out of alignment.

Vehicles: Chevy (GM) Malibu 2001-2005 3.1L SFI OHV 6-cylinder

Your battery has died since the alternator is not charging it. Jumping the car works to start the engine since the Malibu is using the energy of the second car to start and turn the engine.
Its possible that your belt may not be correctly routed or tensioned.

Check your 3.1L engine accessory drive belt routing. The arrow points in the direction in which the drive belt moves.





Fig. 1
Serpentine drive belt routing-GM 3.1L engine L/N bodies

Accessory Drive Belt Installation/Removal
GM 3.1L Engine

NOTE
Routine inspection of the belt may reveal cracks in the belt ribs. These cracks will not impair the belt performance. The belt should be replaced if the belt slip occurs if a section of the belt ribs are missing. A single serpentine drive belt is used to drive all engine accessories. All belt driven accessories are rigidly mounted with the belt tension maintained by a spring loaded tensioner. The indicator on the movable portion of the tensioner must be within the limits of the marks of the stationary portion of the tensioner. Any reading outside of these limits indicates either a defective belt or tensioner.

(1) Remove engine mount.
(2) Rotate the drive belt tensioner in a clockwise motion using a breaker bar or serpentine belt tool.
(3) Remove the drive belt.




Fig. 2.
Removal and installation of the drive belt - tool is shown installed on the tensioner. Arrow points to the power steering pump pulley.

To install:

(1) Rotate the drive belt tensioner in a clockwise motion using a breaker bar or serpentine belt tool.
(2) Install the drive belt. Connect the serpentine drive belt last to the power steering pulley.
(3) Install engine mount.

There are 2 possible diagrams for your car depending on which engine it has. Both diagrams are listed below:


1999 Chevy Malibu 2.4L






1999 Chevy Malibu 3.1L

this is a diagram for a chevy 3.5 belt routing. idler pulley is bottom left.

it doesn't show you under the hood near the hood latch ,newer vehicle it should. check this first.

Well you don't have to remove the tensioner. If you look at it, you'll see a 3/8 square hole in the arm of the tensioner. Put a ratchet wrench, or breaker bar in the hole, and you can move the tensioner, it is only spring loaded. The diagram for how the belt laces in should be on the radiator core support. Lace it for the majority around, move the tensioner, and once you have the belt in line, release the tension on the tensioner arm.

if you buy your belt from Autozone the routing is on the package