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Not enough info. WHICH fan? Engine cooling fan? A/C cooling system fan? Circulating fan in passenger compartment?
FYI - Auto Recall: 2002 KIA Sportage - Engine and Engine Cooling: Cooling System: Fan. Dealers will replace engine cooling fan with a fan made of improved material - recall began on June 11, 2007.
If by cooling system you mean the cooling fan, it takes a while for the coolant temperature to rise enough to trigger the temperature sensor that activates the fan. This is to help warm up the engine and to avoid unnecessary operation of the cooling fan when it is not needed.
If the engine cooling system fan, check the fuse/relay to see if the it has blown out. If not the fuse/relay, the cooling system temperature sensor switch may have failed. For he A/C system auxiliary cooling fan, the same trouble-shooting method. If you are referring to the cabin interior circulating air fan - check the fuse and/or the switch that controls the fan speed.
Blockage in the cooling system No or little fluid in the cooling system Radiator fan not working
Because your radiator is not getting much air forced through the radiator, the only air cooling your system is the air the fan pulls through the radiator. When you travel down the road air is also forced through the radiator causing more cooling.
A few posibillities. Cooling system level low. Cooling system air locked. Radiator fan switch faulty. Head gasket failiure.
The cooling system is the radiator, engine fan, thermostat, and hoses...
PC's nowadays use one main cooling system: the fan. The fan cools down the hard drive, but there are other systems of cooling, too. A new computer produced by HP has a liquid cooling system, where the hard drive is submerged in a certain liquid to cool down the system.
Antec spot is one of the best product when it comes to system cooling. This product features great fan cooling features and it is energy saving.
Fan motor..Water pump..Radiator
Cooling fan not working, or your cooling system needs a complete service. The cooling fan should be on continuously when the A/C is on.