The answer will depend on what engine it is and what it is being required to do.
A Caterpillar see seven diesel engine will begin to overheat at a water temperature of 210 degrees. The recommended operating water temperature is 180 degrees.
The engine will overheat and the pistons will seize.
If your engine thermostat sticks open it will run cooler on your temperature gauge and you won't see the temperature gauge go up to the point where your engine thermostat opens and then the temperature gauge will show a drop in temperature , your check engine light will probably come on , your gas mileage will be less , the heat from your heater probably won't get as hot If the engine thermostat were to stick in the closed position your engine will overheat ( but there are several other causes for an engine to overheat )
i asked this question the tempture gage shows it is over heating but the engine is cold to touch
The normal engine operating temperature for a 1987 Mustang GT is around 200 degrees Fahrenheit. Anything above 220 degrees Fahrenheit might cause the engine to overheat.
There is a warning light which flashes when the engine begins to overheat.
Loop B of the left engine. I recommend you study before a test.
Its just there to let you know that the engine is running at a normal temperature and isn't overheating. If your engine starts to overheat, you can tell then do something about it. Pull over and check, let it cool before proceeding to a garage, before it is too late and the engine is destroyed.
when your coolant in your engine gets a certain temperature,usually 180 degrees,your thermostat opens and your coolant circulates through your radiator and it keeps your engine cool so it wont overheat.
Does that mean that you replaced the thermostat AND the sensor? If not, you really need to replace the thermostat. A sticking thermostat can cause temperature swings and potentially overheat the engine. BTW, BMW engines tend to have serious problems when they overheat. Don't let it overheat or you might be buying a new engine.
Turning the heat on would actually lower the engine temperature. It's a well known trick if your car starts to overheat. Having the A/C on causes a power loss to operate the compressor, which would also cause engine temperature to go up due to the hot air from the condensor going through the radiator.
On the 1976 model, 85 hp Evinrude, the overheat circuit is the only alarm system on the engine. Check the temperature on each head, due to independent thermostats, for an overheat condition.