How do you know a blown fuse for 2003 safari gmc

SOURCE: GMC Safari Van - Change spark plugs

i went under for driver side then i took off passenger side wheel you also have to remove two bolts that are holding dipstick tube in place it is easy to get them from the wheel well on passenger

SOURCE: 94 gms safari van heater blower not working

This van has a resistor under hood for the blower motor and is the blower motor getting power to it

SOURCE: New gmc Safari '88, where is fuse panel?

There are 2. One inside under the Dash on the Drivers site and a Fuse Distribution Panel on the Drivers Side Under the Hood for Maxi Fuses and Relays.

SOURCE: 1999 GMC safari AWD mini van hub /bearing

try this link:
http://www.edmunds.com/used/1999/gmc/safari/11196/specs.html

SOURCE: 2004 GMC Safari van

DO'ES THE VAN TURN OVER ? DO'ES THE VAN HAVE THE FUEL PUMP RUN LONG ENOUGH TO BUILD FUEL PRESSURE?IF YOUR FUEL PUMP AND STARTER ARE WORKING THEN CHECK FOR FIRE TO THE PLUGS. YOU MAY NEED TO GET THE CODES READ TO FIND THE PROBLEM IF YOU HAVE FUEL AND FIRE.ONCE YOU GET THE STORED CODES,REPLACE THE SENDER THAT CAUSED THE CODE OR REPAIR THE WIREING TO IT.