If I don't let the engine warm up until the temp gauge reads ~200 degrees, when I reach 200 degrees under normal driving conditions (Highway use) the radiator fan kicks on and the temp gauge drops to 0. I have replaced the temperature control sensor to the radiator with no success. The only way to turn off the fan is to disconnect the battery to reset the sensors.

Temperature gauge drops to zero AC will not come on. You can pull a fuse to get it to go away, but that does not fix the problem. Also changed maybe a temperature sensor went away for a while and has now returned. Going to try the wiring plug next, but other than that, do not know the reasons recently changed water pump, maybe a vapor locker or something any help would be appreciated