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The Cooling Fans ( 1 Small & the a bit Larger ). The Big One Is For Cooling The Radiator For Normal Engine Usage. When The A/C Is On The Smaller Fan Will Run To Allow More Air To Be Pulled Over The Condensor And Radiator, To Better Cool The Water & Make The A/C More Efficent. There Is A Sensor In The Engine That Controls The Cooling Fan This May Have Gone Bad. I Would Begin My Testing Here First. Then Test The Fan To See If It Is OK. Hope This Helps

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Q: What would cause the cooling fan to only work when the air conditioning is on?
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