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Easiest way is to start the car from a cold start, and just see if the fan comes on after it's warmed up. Otherwise if you want to pull out a thermometer you can test the actual temperatures. The manual says to check the temp at the filler neck of the radiator. When the temp is above 93*C (199*F), then fan(s) should kick on. If not then you need to test the temp switch.
The is a temperature switch located in the left, rear side of the radiator - just above the radiator hose. When it's unplugged and the key is ON, the fan should come on.
To test the switch, check for continuity on the two terminals while it is submersed in gradually heating water. When the temp is below 83*C, there should be continuity, and above 93*C there should be no continuity. If it fails either test - replace it.
I hope this helps.
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