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Are you meaning the HVAC blower fan inside the vehicle is not working, or the radiator fan?
Can I have your VIN to look up fuse layouts and wiring diagrams specific to your vehicle?
Is your coolant level OK? If you don't have good heat, either the heater core is full of air, or there is a blockage. if the engine has heated too much, the A/C system may have vented to the atmosphere and will need to be checked for leaks and recharged.
Does the radiator fan come on if you turn the A/C switch on (engine does not need to be running)