Probably the temperature sender. Should be two of them, one by the thermostat housing and probably one on the head. One is for the gauge and one for the sender. Check the fuse, relay and unplug the fan and run power and ground to it to make sure the fan itself is alright. Most likely is the sender.
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Computer?
1. If the fan has died that's one of the reason.
2. Another reason is that its clogged (Dust/etc) Simple fix Air Duster
3. Circut/wires not in place or stopped functioning
because theres a hamster stuck inside of it.
The most notable fan used for both heating and cooling would probably be of the Dyson brand. They have a product called the Dyson Hot+Cold, which is a bladeless heater fan used for both cooling and heating.
If the question is about the motor fan or engine fan, the main function of this fan is cooling the radiator of the engine which in turn is cooling the water circulating inside the engine unto the radiator and back. This keeps the engine at a fairly operable temperature without overheating and damaging damaging its parts.
The first cooling fan was invented in 1882. It was invented by Schuyler Skaats Wheeler. The ceiling fan was invented in 1887 by Philip Diehl.
Some motors are specially designed for low speed. Some are "invertor Duty" classified so that they can be run on invertor (VFD) normally with a high heat dissipating design. On low speed the cooling effect reduces drastically since the cooling fan is mounted on the same motor shaft. Hence a separate small cooling fan is mounted on the motor, driven by separate power such that it keeps running at normal speed irrespective of main motor speed, thus providing the required cooling effect.
Fan is the thing that makes air to the cooling metal things, the ones that carrys the water. Exhaust is the thing it puts out all the noise.