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Note the diagram for blower motor. Note the fuses, not only check the fuses, check the fuse circuit for voltage, use a test lite. Some of those fuses get ignition feed, they go hot with the key on.
You may have to check feed to and from ignition switch when problem is ongoing? Could be problem with ignition switch? Don't replace anything unless your testing points in that direction.
At the blower motor wire connector, purple wire is voltage, black is ground.
It may not be a fuse, but instead a relay (30amp) located in the fuse block INSIDE the engine compartment, not inside the vehicle interior.
Relays go bad too though.
Trace the voltage. Is there voltage at the motor? If not trace it back through the resistor to the switch to the fuse. That will probably tell you what you need to know. Does it work on ANY blower speed setting? Replacing parts before testing is ALWAYS going to be frustrating.
http://www.a1electric.com/s10motor.htm. This link has pictures and step-by-step instructions. I found it and have both sides to replace. Hope this helps.
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