The fan isn't turning on because the engine isn't overheating; certainly not in 5-6 miles. Rather than throwing parts at, which is the most expensive and least effective way to repair a car, have it diagnosed by a mechanic who will use a special tool at the radiator to check for a leaking head gasket. It's a tube with dark blue fluid inside. He will draw air from the radiator through the fluid. The fluid will turn bright yellow in the presence of combustion gases from a leaking head gasket. The gases blow into the cooling system causing the appearance it's overheating.
The fan turns on when the coolant hits 210 degrees and turns off around 198 degrees. If the engine is actually overheating, the fan will turn on and there will be steam coming from the overflow reservoir.
Wednesday, December 9th, 2009 AT 12:33 AM