I just checked a couple of blower motors and got .6 and .7 ohms which is very close to your reading on your motor. It sounds like you are loosing contact slightly in your switch but that would not cause blowing of the fuses.
I suspect that you have a blower motor problem and you should be able to check the draw when it is running if you have the right ammeter setup. ( I use an ammeter that read by placing it over the wire).
Jim
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