How do you install a serpentine belt in 1995 ford aerostar sport -diagram please?

What ever search engine you use, type in www.autozone.com/repair_info.

Now you see a page of search results, on the one showing AutoZone.com | Repair Info

click on it. Now on the left side of the Auto Zone screen, find Vehicle Repair Guides and click on it. Now select vehicle year and click on it. Click on Ford. Click on Aerostar 2 WD or 4 WD. Click on 3.0 or 4.0. Now it shows Repair Guide so click on General Information & Maintenance. On right side of screen click on Routine Maintenance & Tune Up. You should now see a list of different items including Belts, click on it. Scroll down to see Removal and Installation now look for your motor, click on it. You should find all the routings you need for the serpentine belt.