Most likely, your engine temperature sender is bad. depends on the car but it's one of 2 sensors under the hood. usually located in the cylinder head and intake manifold. cheap and easy to replace.
Because car manufacturers design their products to function.
The temperature gauge on a car fluctuates because the car's thermostat is opening and closing. The gauge goes up when the thermostat closes and the gauge goes down when the thermostat opens.
Mine was a bad ground on the gauge. Easy check by any certified mechanic.
Yes the temperature gauge will still work. If it stuck open the car will run cool. If it is stuck closed the car will overheat.
because the engine in that car does not cool down
A signal from the temperature sensor on the engine.
Start with the fuses, then go to the more complex problems
well your car needs a new body kit because that contributes to the temperature of the car
=A Gage is gun a 12 gage=
StUck in open position
That depends on what the car is supposed to run at.
If you temperature gauge is going up and down then you may have a problem with your sensor. You should take your car to a professional to ensure that you don't overheat your car.