As Dennis covered, for your Van, you'll likely fine your fuses behind
the left rear pillar (open up the rear hatch, and you'll find them
behind the cover on the left side.)

There are 3 fuses there on most AC systems. 2 for the blower motors (2
blower motors working in tandem) and one lead fusible link.

Since the blower quit all at once, your fuses (or the fusible link)
have most likely blown. While replacing them is easy, finding the CAUSE
of why they blew is another issue. A volt ohm meter is usually
necessary for finding a short to ground.

The Bentley electrical diagrams aren't the easy to read for a novice,
but once you understand them they can help you identify those circuits
you need to check.

For what it is worth it is almost certainly worth your time to figure
out how to do this (finding shorts in the electrical system) as it is
extremely expensive to pay someone else $60-80 an hour to do it...