Yes.
It will keep the temperature within pre-set limits if working properly.
Either the thermostat is not working properly or the temperature sensor is displaying wrong on your gauge.
Low Coolant? Weak Temerature sensor? Weak gauge Gauge working properly and recording the thermostat opening and closing as engine temperature fluctuates
It depends on what type of car you are working on. all cares have different temperature thermostats. A very common temperature is 195 degrees
Check the fan clutch, it may not be working properly.
If a thermostat is not working properly, you cannot calibrate it. It must be replaced.
Yes. Your engine will get the best mileage at full operating temperature. If the thermostat is removed or not working properly causing the engine to become too hot or not hot enough it will affect the operating efficiency or your engine which will decrease your gas mileage.
A person can tell if their home heat pump thermostat is working by setting the temperature a few degrees above or below ambient to see if it kicks on. A thermometer can be used to verify the temperature.
When your car is at idle there is no air flow to cool the radiator, but when your car moves the air flow through the radiator cools it down. I would suspect the radiator fan is not coming on when it should. If the fan is working properly the engine temperature should stay fairly constant assuming the thermostat is also working properly.
depends on the thermostat. Typically 195 degrees Fahrenheit
A thermostat not working properly could be blocked with semi-solid coolant.
Low coolant? Bad thermostat? Heater core plugged? Heater core airbound? Temperature control cable not adjusted properly?