Heating AC and Engine Cooling
Ford Aerostar XL
Grand Prix GT

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

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2006-07-09 22:40:11
2006-07-09 22:40:11

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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Start by bleeding the cooling system of air. Google is your friend.

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Only when you don't turn it on.

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yes idiot the antifreeze is to keep the water from freezing

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The only way to find out for sure is to have the cooling system pressure tested.


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