I just gave this info for a1995 Aerostar but the information should be the same for your 1993 also.
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.
My 1995 Ford Explorer has a diagram in the front of the engine compartment showing how the serpentine belt is routed . Does your Ford Aerostar not have that .
go to napa auto parts online
As far as I can tell, there is no EGR valve on 1993 Ford Aerostar 3.0L engines. I have searched and found none and the vacuum hose routing decal in the engine compartment does not show an EGR valve.
I need the routing for the serpentine belt for 1990 Ford 150?
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Yes they are compatible
Go to Autozones site and check out their repair and specs section ...it's basic but good. http://www.autozone.com/
On a 1993 Ford Aerostar 3.0 ( and 4.0 ) 3 - 6 2 - 5 1 - 4 front of Ford Aerostar
Need 2001 Ford Escort Zx2 Serpentine Belt Routing Diagram, Can You Help?free
A 1993 Ford Aerostar would have come from the factory with ( 5W-30 )
Check under the hood for a black and white sticker. Should be labelled serpentine belt routing.