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If you hit the tank and thermostat housing with a laser thermometer and saw a >20* difference, I would not suspect the fan thermostat or engine thermostat is bad. Around 185*F is normal for internal combustion engines (diesel or gas). The boiling point of water in open air at about sea level...

One other thing - the temperature sensor is just a temperature sensitive resistor in a case submerged in the coolant. If they fail, they can have an internal short to the case (ground). This can also make the temp gauge bounce up. If you check the grounds and check the signal wire and it is...

"Everything new" makes me think assembly issue, most likely grounds or a bad connection in general. If everything was out and put back in, I just takes one or two loose grounds to make analog gauges go wonky. That it seems to come and go leads me to presume vibration is causing a ground in the...

Might be a stuck thermostat, or a corroded water pump impeller... Might drain the coolant system to pop out the water pump and make sure it's actually still attached to the pulley (check the thermostat while you're in there and it's drained). I put a super sized radiator in my pickup truck and...