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Could be the fan itself or the radiator fan switch. The fan shouldn't start running with the engine unless the a/c is ON or radiator temperature is over 45c, if a/c ON expect to see 15% speed, when radiator temp over 45 fan runs at 28-30% and speed % climbs up as radiator temp increases.

Better to invest on the k-dcan cable and scan her and go from there, to monitor temp, sensors and fan speed values.
 
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