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The fan switch, which is located in the bottom of the radiator, can be 'tested' by elimination. If you tested the fan and its ok, yet the quad overheats without kicking on the fan, it's probable that the fan switch is bad
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Once mine fan would not come on due to the connnection between fan and rad sensor was very dirty, I cleaned it up and it worked after that. its the connection with the brown and orange/black wire.
The rad sensor also has a 10a circuit breaker on its red/white wire, if that could ever be the problem.