Serpentine belt 1999 chevy malibu is slipping off cranshaft pulley

takje off




take off the belt and turn all the pulleys ,the alternator and the a/c compressor if equipped....something is siezed

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.

1999 chevy malibu 6 cyl dosen't have a timing belt just the serpentine drive belt the routing diagram should be under the hood

The path should be listed under the hood on a decal, you will need a breakerbar and apropriate sized socket to compress the idler to put the belt over that pulley... just remember to put the breaker bar through the belt before compressing the idler assembly .

one or more of the pulley's is defective, most likely the tensioner pulley, but check them all for wear and side to side movement which indicates a worn bearing, this causes the belt to not run true and chirp.

The A/C pully is supposed to spin freely until the AC is activated to run.. The cranshaft pully does not. Replace the tensioner pully. The belt has to fit in between the grooves on the pullys.

if one of the pulleys(power steering is not uncommon) have been removed it is possible it was not pressed back on to the pump shaft far enough. this will cause the wear you explained

belt tensioner is not doing its job!! but with out looking at it is hard to tell. i f the crank pulley is not bent or harmed, it is probably the tensioner.