Serpentine belt diagram

Hello.

Here is a link that shows all the engine options and belts and how to change them out

https://www.2carpros.com/diagrams/nissan/altima/1999

Please let us know if you need anything else to get the problem fixed.

Yes, it appears that it does.

Roy

A/C belt is on outer ring of pulley and has to come off first.

There is a tensionier that holds the belt in place. The automatic tenionier turns. Take a wrench and turn the tensionier in the direction to loosten the belt and slip the belt off.

You have two serpentine belts. A larger one controls all but the AC pulley, an the smaller one runs that.

Yes, I suggest that you purchase Haynes manual 72016 (covers Altima from 1993 through 2004).

Once you have the manual, turn to page 1-17.

Adjustment - all models except the 2.5L engine.

Belt tension is adjusted by moving the idler pulley. To adjust the belt, loosen the lock nut (or adjuster) and turn the idler pulley adjusting bolt (usually on the bottom).

Replacement - all models except 2.5L engine

Loosen the drive belt adjustment bolt, slip the belt off the crankshaft pulley and remove it.
Remove the AC belt first to gain access to P/S, Alt, W/P belt. It is a very good idea to remove both belts at the same time.
Mark each belt and its appropriate pulley groove so the replacement belts can be installed in their proper position.

https://www.2carpros.com/car_repair_information/tec_info/1997/nissan/altima/1997_nissan_altima_drive_belt_routing_diagram.htm

'98 should be the same