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I believe it turns on and off the fan (1 out of 2) that cools the engine according to the temperature it's at. If it doesn't work the engine may not know to turn the fan on and the engine could overheat. Here's a tip. When you turn on your A/C or Heater, both fans come on. The A/C cooling fan and the Engine Cooling fan.
Yes, it won't make the cooling fan turn on even if the fan is fine. If there is a check engine light on and a code for that shows up its possible.
Yes. There could be several reasons for engine to overheat.
The engine will overheat.
cools the engine. without a fan, the car will overheat and the coolant will boil. the fan controls this from happening by cooling the coolant as it passes through the radiator.
A fan that is connected to the engine will turn whenever the engine is running, an electric fan will only run when the engine is at the proper temperature, some also turn on whenever the AC is on.
check clutch fan
Defective cooling fan or bad fan relay.
cause you need a fan clutch, it is part of the engine fan. By Hector C. EPT
The fan might spin slowly, or not at all. By not spinning at speed, the fan will not cool the radiator enough and the engine could overheat.
the PS2 slimline does overheat because there isn't a fan inside it, the larger PS2 does have a fan and will not overheat
Evidently the cooling fan is not working.