The fans are controlled by the ECU and his buddy the Fan Controller. The book says the fans are off above their stall speed of 80 MPH. You might have a bit of air in the system there are bleed screws front and rear.
Does your car still have A/C?
Turn on the A/C on the warmup lap and/or in the pits on the way to the track. This will trip the pressure switch which will turn on the fans. Then you can turn off the A/C and the residual pressure will keep the fans on for a short time (2 min or so).
It took me 30 minutes to check both bleeds, with no prior experience of the task on the car. Remove the front passanger wheel and the wheel well liner. You should see the bleed screw up at the top right next to the radiator. The second one is right next to the engine on the driver side.
Start the engine up and let it get up to normal temps (like 190 if you have stock thermostat in it). Then slowly twist open the bleeds until water comes out. Do that a couple times on both ends. Thats it.