The Oldsmobile Alero generally has only one belt that runs the alternator, water pump, power steering and air conditioner. The manufacturer recommends checking this belt every 6,000 miles or 6 months for possible replacement due to normal wear. This article refers to the model years from 1999 to 2003. Check specifics for your model year to ensure correct tools, methods and systems.
Find the belt tensioner pulley. The Oldsmobile Alero has an auto-adjusting belt system where the tensioner keeps correct tension on the belt. This is generally between the crankshaft and alternator and you can see the tensioner pulley is not connected to an accessory.
Rotate the tensioner pulley bolt counter-clockwise to release tension on the belt. On a 2.4L engine, most models need an open-end wrench to rotate the tensioner. On V6 models, most use a 3/8-inch ratchet or breaker bar tool that fits into the bolt head.
Note the arrangement of the pulleys and if you don't have a belt routing diagram under the hood or in your manual, draw a sketch for your reference.
Slip the old belt off and slowly release the tensioner.
Use your belt routing diagram to replace the belt on the various pulleys. Rotate the tensioner again to allow the belt to fit on all pulleys.
Check the belt to be sure it is seated on all pulleys, then run the engine and check for any flapping or other signs of incorrect installation.
