Check your electric cooling fan
White smoke from the exhaust indicates you have a blown head gasket or cracked head. Stop driving the car until this is repaired or you will do serious damage to the engine.
Thermostat.
IF YOUR CAR IS HEATING UP(OVERHEATING) AND YOU STILL DRIVING IT, A FAULTY THERMOSTAT IS THE LEAST OF YOUR PROBLEM.
Water Pump or Thermostat. May have to change water pump to replace thermostat.
i had the same problem in my 96 grand-am i actually replaced the radiator, coolant overflow tank, and thermostat before it stopped. Check your coolant overflow tank and check for cracks and whatknot. If nothing else check the fan and make sure all belts are in proper motion and stuff. hope i was some help
1) ONE THING YOU COULD TRY IS CHANGING THE RADIATOR CAP...IF IT'S BAD THE CAR WILL BOIL OVER AND APPEAR TO BE ALWAYS OVERHEATED WHEN ALL THAT'S REALLY WRONG IS THE LACK OF PROPER BACK PRESSURE DUE TO AN OLD/DEFECTIVE RADIATOR CAP. 2) IF THAT DOESN'T WORK YOU COULD TAKE THE THERMOSTAT OUT AND TRY DRIVING THE CAR WITHOUT IT IN AND SEE IF THE CAR RUNS LONGER BEFORE OVERHEATING...IF IT DOES THEN THE THERMOSTAT IS STICKING. THE THERMOSTAT COULD ALSO BE UPSIDE DOWN...IF IT IS IT WON'T WORK RIGHT. patricklaw1957@yahoo.com You might also check the timing.If it is retarded due to a bad timing chain or needing a tune up this will cause overheating.
Ideally, a thermostat should be changed before it fails or begins to fail. Personally I would change it every five or six years or so, with normal driving.
have you checked the fan
Check coolant level Could be thermostat is not opening Could be a bad water pump
Did you replace the thermostat, and check the water pump? Does the cooling fan operate as it should? A plugged catalytic converter can cause overheating. If above items check out OK you need to check for leaking head gasket.
Your car overheating can be from many of factors. If it is not overheating while you are driving down the road it could possible be your electric fan has stopped working. Another possibility is that your fan clutch has stopped working on your manual fan. The main possible reason though is the fact you do not have a thermostat in it. Without the thermastat your coolant isnt slowing down enough in the radiator to cool off so that it can cool your engine.
that means that your thermostat needs to be changed it calls for 195 Fahrenheit in cold weather and a 180 degree for summer but it seems to me that your thermostat is stuck in the open position and its not keeping the antifreeze at the proper temperature if it were overheating the thermostat would be stuck in the closed position after changing the thermostat and in the future it starts overheating you would need to replace the water pump or the belt if the belt is loose it would keep the water pump from spinning at the proper ratio in order for the water to circulate in the cooling system in your motor this advice is for future reference in case it happens while we're on the subject good luck that should cure the problem