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The simple answer is, if the blower motor is getting 12 volts, and isn't turning, you have a bad blower motor. The compressor has nothing to do with it.

The symptoms also point toward a bad motor (higher voltage when rev'ing the motor gets the motor to turn). You may have gotten a new blower motor that was defective, or done something wrong installing it. You should plug in a new blower motor before bolting it in place, to check its operation.
 

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Again, if you have 12 volts going to the motor, and it's not turning, it's a bad motor, plain and simple. You said that you did have 12 volts at the motor in your first post, so - unless you messed up the measurement - you have a bad blower motor.

If everything else is right, you should be able to run the blower motor unmounted.

Have you checked the fuses associated with the circuit? You might have popped one trying to get the new motor / resistor hooked up.
 

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One more time, and then I promise I'll shut up.

If you are getting 12 volts to the motor and it's not turning, it's a bad motor. Of course, there IS a ground involved (just in case your meter is connected from a vehicle ground instead of the negative power lead to the fan).

But it's almost like you're telling us that you have 12 volts at the motor, and it's not turning... and then you take it out and put the same 12 volts to it and it does turn? If so, you're just doing something wrong (check the ground connection?).
 
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