Why is my car overheating? - 1

I just replaced my thermostat in my 95 Honda civic, it fixed the problem for a few hours but when I went home and let it sit for a few hours and got back into it, it overheated within 5 min. I checked the oil, coolant, and there was plenty. However my fan was not turning on, and my heater was cold. So I wired the fan to the battery only because I needed to make it home and it turned the fan on but it didn't stop or fix the overheating. The fuses are good too… Please help!

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