Hi,
Here’s the procedure for replacing the water pump for a 2000/2001 Nissan Altima L30 taken from the [https://cardiagn.com/2000-2001-nissan-altima-model-l30-factory-service-manual-pdf/|2000-2001 Nissan Altima Factory Service Manual] ''Engine Lubrication and Cooling System'' section.
[image|2182595]
(click on image to enlarge for better viewing)
Here’s the procedure for replacing the water pump for a 2001/2002 Nissan Altima L31 taken from the [https://cardiagn.com/2001-2002-nissan-altima-model-l31-factory-service-manual-pdf/|2001-2002 Nissan Altima Factory Service Manual] ''Engine Cooling System'' section.
[image|2182597]
(click on image to enlarge for better viewing).
Hopefully one of these will be of some help.