If the Frigidaire freezer fan motor stops working after running for 5 seconds, you can try the following steps to fix it:
Unplug the freezer from the power source for safety.
Check the fan blades for any obstructions or debris causing them to get stuck. Clear away any blockages and ensure the blades can rotate freely.
Inspect the fan motor for any visible damage or loose connections. If the motor appears faulty, it may need to be replaced.
Verify the fan motor wiring connections are secure and not damaged. Reconnect any loose wires or repair any damaged wiring.
Plug the freezer back in and test the fan motor. If the issue persists, it is recommended to contact Frigidaire customer support or schedule a service appointment with a qualified technician for further diagnosis and repair.