Originally Posted by MMZ_TimeLord

So, I have not yet mapped out the entire circuit yet. The information I have gathered to date points towards this unit as being a simple linear voltage regulator controlled by the zero to six plus volts DC coming into the unit and providing a low to 12 volts DC to the fan motor. This is inefficient and wasteful (Heat).

It has been suggested that this module has some sort of function relating to temperature control of the system. IT DOES NOT!