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One main fan not work other fan work.


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The two fans are a main radiator fan and a sub-fan.  The main fan comes on when the car reaches "xxx" temperature (usually around 85 celsius), while the secondary fan only comes on when the AC is on (specific times for this as well) and when the car exceeds a second set of temperatures (higher than what kicks on the first).

 

There should be two green connectors under your dash.  Plug those together and see if the fans cycle on/off as they are supposed to.

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