How do you disconnect the fan on the air conditioner?

Find failed stuck relay in under hood fuse box and replace.

i assume you mean the blower motor fan for the a/c and heat on the inside of the car,and not the cooling fan under the hood.if so,the blower motor resistor/module is bad.needs to be replaced.it is located behind passenger side of dash near the blower motor.there are two different ones.one is for automatic temp control,the other is for manual temp control.you can get it at any autoparts stores,they may have to order it.if you have manual controls,it's about $35.00.if it's automatic controls,add $100.00 to the $35.00.the auto has 2 small connectors,and the manual has 1 large connector.good luck.post results.