Get a good fuse tester. Test all fuses. There are two fuseboxes. One under the hood & one inside the vehicle. All the fuses can be tested while still in the fusebox. there are test points facing out on each fuse. The ignition switch should be in the "on" position during the fuse testing. Power on only one side of the fuse, the fuse is bad. Power on both sides of the fuse, the fuse is good. Power on neither side,may be a spare fuse. If all the fuses test good, the blower motor may have to be tested. Most Durango blower motors, can be removed for testing &/or replacing from under the right side of the dash, without a lot of work.
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