The fan only really needs to be on when your idleing. That is what draws air through the vanes on the radiator. 120 degrees is not overheating. Given your using your cars gauge to get that reading. Check your temp sensor and there should be a fan relay and or a fan control moudule for your radiator fan. It tells when to cut the fan on and off. If you want there is an after market fan control at local auto parts you can install to control the fan.
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