This a picture of the heater box that holds the blower motor and evaporator
if you notice the box has like a round hole , that is where the motor goes in , what you looking for is to get to that plug motor to test it , and also notice the last picture on that heater box on to of it there like a square box with 2 screws that is our blower motor resistor , you should be able to unscrew this and should drop , that contorl the speed o the blower motor .
*** note this is not the exact box in your car , but it is for a Maserati , it is just for point of reference
Hope I was helpful to you , Please let me know if you need anything else on it
I m online daily from 10 am till 12 pm , i will get you some part numbers by tomorrow
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Chad Farhat ( aka -Customer)
ASE Certified Technician