continuation of discussion on car that overheats

one other reason why car overheats.

 The thermostat is stuck up closed. A thermostat is a device that when the water coming from the lower radiator  that will pass thru it  is still cold will remain  closed preventing the water that comes from the radiator to enter the engine,( of course there is already an existing water inside the engine) , when the water inside engine heats up( it is assumed that the water inside the engine heats up easily  since there is no water coming from the radiator) and it  goes to the  radiator and passes thru the lower radiator hose,  this thermostat opens allowing the hot water to enter the engine.  take note that the engine needs a normal temperature or desired temperature or a little bit hot temperature, of course a cool engine below the desired temperature would be running inefficiently, 

this thermostat is preset to close and open on a given temperature, hot or cold. this temperature setting  is set by the manufacturer depending on the type or design of the engine .

that means , if this thermostat is defective and it  remains closed or stuck up closed, the water inside the engine will continue to rise up to the boiling point of water because the water that came from the radiator that was cooled off a little cannot enter the engine, hence the overheating situation.  

HOW WOULD YOU KNOW IF THE THERMOSTAT IS NOT FUNCTIONING THAT LEADS TO THE OVERHEATING.

  if the water that was cooled off  by the radiator cannot enter the hot engine due to stuck up closed thermostat, it is expected that the LOWER RADIATOR HOSE when you touched it will be a little bit colder than the UPPER RADIATOR HOSE..

to be able to verify or confirm , if in fact the thermostat  is defective , all you have to do is removed the thermostat, put it in a boiling water and you will notice that it did not open up.

if you are in a temperate zone or a country that is not experiencing cold weather,  there is no need to put a new thermostat.  , but observe any unusual reaction of the engine afterward.

to be continued to talk about other causes