There is no resistor. The motor is PWM controlled by an electronic module that people frequently call a resistor.FWIW - Changing motor is very straightforward, and the part is inexpensive. In my case I swapped over the resistor from the old one, as I had to replace mine due to the fan becoming noisy
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I had to replace the front HVAC blower in my 2012 X5 35d in July last year at around 220k miles. It quit on me in the middle of a weekend road trip from Nashua NH to Belfast ME for the annual Maine Celtic Celebration festival. It was record setting blistering hot and humid on that weekend too, the hottest days of the year. The motor bearings were worn and the lubrication was used up and the motor was howling and running slow due to shaft orbit. The motor was slowed enough that there was next to no airflow from the vents and the control module kept shutting the motor off to protect it from overheating and protect the module. The motor would be off for a few minutes and then start up and howl again, only to shut down again a couple of minutes later. The 200 mile road trip home was done the HVAC system OFF and with all windows down while on the highway so that the ride was at least tolerable in the hot weather. It was my "4-70 A/C" - all 4 windows down @ 70 MPH.
The new blower assembly included a new module with it. Replacing the blower was straightforward but it required being a bit of a contortionist to install. A friend of mine liked to call it "Dashboard Olympics." The job was straightforward but NOT fun. The trick is to be able to get your head fully under there to be able to look straight up and see what you are doing. The information on NewTIS was a big help.
I haven't had to replace rear blower motor yet with the car only at 241k miles now.