You can do it.
I'll try to explain it.
First, make sure your battery is charged - trickle charge for 24-hours is best
The car should be turned off, cars out of the ignition before doing the next steps.
Second, pop the bonnet on the drivers side (on a RHD) car; in front of the passenger compartment, you should see a large metal box. At the front of this box will be a black switch with a red push button.
Press the red push button and a small arm will pop out. This is resetting the ECU.
Leave the car for 5-minutes (do not push the arm back into the side)
After 5-mins, push the arm back into the side of the black switch.
Close the bonnet and start the car.
This will have reset the ECU and should resolve any lights, cabin fan, indicator issues.
I can take some photos if the above doesn't make sense.
