[AC blower problem]

This is my first time posting. I have a 2000 740i that has several problems. It is actual my wife's car and she loves it. The A/C motor is growling and shuts off intermittently. I have preview the post as to how to remove and test the motor, but i would like to find out why the A/C system come off and on. Could it be that the fan motor is so bad that it is getting stuck and then restarting?

I would appreciate any help as taking the dash off is no easy job and I would like to do it right the first time. I replaced the evaporator coil a few years back and had to take out almost the entire dash to get to it. 

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