Yes, because your vehicle will overheat.
The car can begin to overheat because it is low on oil or antifreeze/coolant. Your radiator can also be acting up. It is best to address this as soon as possible and not to let it go.
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.
If the temperature gauge rises quickly when you start your car, it probably needs antifreeze. Watch out when you fill the radiator. If antifreeze starts pouring from some random place under the engine, then your freeze plugs are probably shot. Cheap part to replace -- about $5. But the labor cost ... Ouch ...
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.
Be sure that you have adequate antifreeze in your car, the temperature has been dropping sharply.
because the engine in that car does not cool down
yes if the thermostat is stuck open the gauge will read low the water or antifreeze will flow straight through the engine and radiater if it is stuck closed it will over heat your car
A signal from the temperature sensor on the engine.
If you are referring to the temperature reading on the gauge, then it's possibly a bad thermostat.It will also read 'cold' until the engine has sufficiently warmed up.Lack of fluid (water and/or antifreeze) in the radiator.Low engine temperature (bad thermostat).Low coolant level.Bad gauge.Wiring issue.Coolant temperature sensor bad or not correctly grounded.Problem in an electornic control module.
bad water pump
well your car needs a new body kit because that contributes to the temperature of the car
the fuction of the temp switch. is to comunicate with your car computer and register the temperature on your cars gauge. to let you know how hot your car is running or if its at risk of over heating. whitch if occurs can cause very expensive repairs