I would check the fuse and the relay for the blower motor. If both of these are okay, then it may be a problem with the fan.
It could also be a problem with the switch itself.
Try checking all of these things first. If they are all okay you will probably have to have someone diagnose the electrical circuit.
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〉 Answered on Aug 27th, 2007 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines