Sounds like the electric fan might be your problem, but without more information it's only a guess.
Now my 2¢,
If you have a overheating problem, putting a lower temp thermostat isn't fixing it. I've never understood the thinking that a lower temp thermostat is the way to go. When the car was new, it didn't overheat with a 180° thermostat, so why would a 180° therm be bad now? Something else is happening, clogged radiator, kinked hose, bad fan electric or clutch, engine timing, or a bad therm. There's nothing wrong with a hot running engine as long as it's within the specs and the cooling system is working properly.