I have been having sporatic problems with my 2002 Infiniti I35 A/C Blower Motor. Sometimes when I turn the car on and the A/C is already in the on position the compressor will start, but the fan motor will not. Then I let it sit for a while and start it again and it starts up like nothing is wrong. I'll go days or weeks before it happens again and then the same thing it comes back on the 2nd time I start the car. What could be causing this erradict behavior of the blower motor?