ASFKAP,
I'm fairly sure your QRH won't tell you to pull the fire handle for a high nacelle temperature.....
In case of an overheat light, the QRH says reduce thrust until the light goes out and operate at the reduced thrust. If light remains on, carry out "engine fire, severe damage, separation" drill. This does require you to pull the fire switch . If the light is still on you activate the extinguisher.