Yes
There are a few reasons a vehicle is overheating. The common causes are the thermostat, water pump, radiator, or the fan stopped working.
Is vehicle actually overheating? Could be a bad temperature sending unit or gauge Check temperature with a thermometer If thermostat does not open vehicle will overheat
Engines are designed to operate at a given temperature, without a thermostat the engine will often not get up to the designated temperature. So it needs a thermostat to be sure that the engine will run at its optimum design rating.
Yes a thermostat will cause any vehicle to over heat, just go to local parts dealer and get thermostat and replace it and if that does not work take to SAE trained professional techination.
Replacing a bad water pump can help to stop a motor from overheating. Hopefully that was the cause of the overheating. If it does not stop the overheating, try replacing the thermostat. Make sure you have the proper mix of antifreeze and water, the radiator filled with it. Check the level of coolant FIRST. Next, the hoses, and third the thermostat. Then, disconnect a hose and see if, by starting the vehicle, if there's water pressure. If not, its water pump time!
If the vehicle has electric cooling fans, do they turn on? Could use more info like year, make and model.
You may need to change the thermostat. Follow the top radiator hose to the engine, it is under the cover that the hose connects to.
If your vehicle keeps overheating, you should flush the cooling system, replace the coolant, and replace the thermostat. In fact, you should have done that before this.
You can test it by squeezing the upper hose as vehicle warms up. When it opens more will flow through the hose-enough to feel the difference. ..................................................................................................................................................... Also, Watch the temperature gauge. If it rises to the red "warning area" then the vehicle is overheating. This is a sign of a stuck closed thermostat. Most vehicle come equipped with a fail-safe thermostat that will stay in the open position though if it were to fail. If this is the case, the vehicle heater will seem like it will blow much colder on cold days. Also, if it is stuck open, your temperature gauge will read lower while driving than while at idle. If it is overheating, you will also want to check your coolant level first. Also check your belts and your water pump. Strangely enough, low coolant level is the cause of most overheating problems. Good luck.
In very short: If the thermostat stays open, the warm-up time for the engine will be significantly longer, resulting in unwanted start-up wear. If the thermostat stays closed, the engine coolant can not circulate through the engine and cooling system, resulting in the engine overheating, as the coolant is used to keep the engine in a specific operating temperature.
If thermostat does not open - Vehicle will overheat in a short time - no heat If thermostat does no close - vehicle will not get to normal operating temperature - no heat
i have never done a thermostat swap on a 96 jetta but i would assume it is about the same as any other vehicle as they appear to be pretty universal. just locate the thermostat housing which will be metal and usually in a bubble shap to give clearing for the thermostat. then carefully open the thermostat housing as not to damage it wich might cause leaking. remove the thermostat from the housing and be sure to remove all the rubbery sealer from around the inside of the housing. a putty knife usually does the trick well. then put a new seal in and the new thermostat and replace the housing over it. make sure everything is secure and start the vehicle. squeez the hoses while you're vehicle is running to make sure you have flow and the hoses are warm. check the housing for leaks. and make sure the vehicle isn't overheating.