Where is the fan located for a/c it comes and goes

What would be the reason for this though? My 2001 Sonata has a similar issue. When I start the car in the mornings, turn on the fan, it blows. However, if I stop the car and re-start it shortly after, it does not blow (when stopping to get gas, etc). Is this a Blower Motor Resistor problem, a Blower Motor problem, or is it an A/C switch problem? Another clue, is that there is electrical noise through my radio at the lowest speed and less at the highest fan speed.

The Blower Motor is in the Heater Housing at the bottom right hand area of the dash.

In my 2000 Elantra the box is located just under the glovebox. It is a small round black plastic box with wires coming out of it. I tap on mine until the blower is blowing at full speed. Sometimes have to tap it twice. Kneel down and look under your glovebox.