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It sends a signal to the climate control unit to allow the blower speed to increase once the engine coolant is to a certain temperature. (so it doesn't blast you with cold air when starting the car on cold mornings etc...) The aux cooling fan is controlled by a temp sensor on the receiver dryer of the A/C system....and also by a sensor by the radiator on some cars....
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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