I had my 03 X 5 in idle for about 5 minutes, ran an errand. When came back, fan Blower had stopped. Moving the fan speed to max etc did not make it come back on.

Shut off the X 5 for about 30 minutes. When I came back, started the car and the fan now works.

Since it is under extended warranty, what should the dealer check? The obvious suspect is the Final Resistor, but that either goes off completely or works, right?

Thanks.