If installed correctly,Idler arm should provide the correct amount of tension. Check belt diagram for posssible misrouting. Replace belt and idler arm if correctly installed
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There are several videos on how to change out the serpentine belt For more info just do a web search " 2002 Nissan Altima serpentine belt replacement".
TO REPLACE DRIVE BELT YOU LOOSEN DRIVE BELT ADJUSTMENT BOLT SLIP THE BELT OFF THE CRANKSHAFT PULLEY AND REMOVE IT. IF YOU GOT A 2.5L ENGINE YOU HAVE TO ROTATE THE BELT TENSIONER TO RELEASE TENSION ON THE SERPENTINE DRIVEBELT.YOU NEED A HAYNES MANUAL.IT WILL SHOW AND TELL YOU HOW TO ADJUST DRIVE BELT AND MEASURE THE DRIVE BELT DEFLECTION USING A STRAIGHT EDGE RULER.
Loosen the 14mm nut on the A/C idler pulley and the loosen adjusting bolt. Remove A/C belt. Then loosen all bolts on the alternator and back off the adjusting screw. Remove belt. Reverse procedure.
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