Hello Prius friends. I’m having issues with overheating and hope someone can assist with some ideas. I have a 2012 Prius V. During the summer car ran fine no issues. In the summer I replaced radiator due to a a leak in radiator. As soon as winter started i had no heat so then I decided to purge the cooling system and didn’t help. I’ve replaced water pump and thermostat and no I’m having problems with overheating. Car heats up then in high speeds I get the high temperature light flashing. I have to slow down to make it go away. * I pulled over last night and noticed the fans would come on and off when car was overheating. The strange thing is that the water pump would do the same thing. It wouldn’t stay running constantly, it would come on and off. I was able to hear the coolant flow on and off. Does anyone know what controls the water pump to make it stay running constantly. These Prius’s have two temperature sensors I’m assuming one is for engine temperature and the other one is for HVAC. Any input is greatly appreciated.