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You are looking for the fan to continue spinning for more than 5 seconds after engine shutdown. If it does, your fan clutch needs to be replaced. But if it's not roaring, its more than likely worn-out.
One of the two coolant temp sensors on the head (blue) is also called the 105/115 switch. At 105 its supposed to trigger the aux fans,and at 115 it is supposed to shut-off the AC. With KEY ON, unplug the blue temp sensor. It should kick the aux fan on high.
If not, it could be the aux fan resistor (lego sized box on the drivers side engine bay), or it could be the aux fan itself (try applying direct power to fan). There is also a cube relay in the fusebox that is a part of the aux fan system.
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