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You don't specify what type of car, but typically there are only a few possiblities. With the AC on (as long as the AC system is properly charged and working), look to see if the AC compressor is engaging. If so, the fan should also have power going to it. Check the wires attached at the fan motor for power. If there is power, the fan motor is failed. If not, then check the fuses and the relay for proper operation. If the AC compressor is not engaged, the fan may not be asked to turn on by the computer that controls it. Then it is a matter of checking the AC system to find the fault.

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18y ago

What else can I help you with?