Kevin Vevang

Audi TT Overheats when in hot weather in stop and go traffic. Checked engine fans and the smaller one comes on high with the air conditioner running and goes to the slower speed when air is off. Not sure if the other fan works or if the fan control unit is bad or not. Just put a new water pump, thermostat & timing belt but I had this problem prior to and was hoping the water pump would fix the problem. Can anyone tell me where the Auxilary Fan Control Unit is located?
Thanks
Kevin