A car engine works much the same way, averaging between 195-220°F. Submitted: 13 years ago. When it opens, the coolant is then able to circulate. How does the thermostat in a car's cooling system work? Ratings of Temperature When the thermostat is closed the coolant is kept in the engine. Fortunately, car thermostat replacement is easy enough. How does a thermostat work? Most automobile mechanics will tell you it is not a good idea to … The thermostat plays a balancing role in keeping the engine at the optimum temperature. If the car thermostat fails to do this then the car can overheat and your mileage can be affected. At the same time it keeps your car warm it also keeps the engine cool. It takes a greater amount of time to warm up the engine. How does the car thermostat work? One of these vital elements is a thermostat, which enables the car engine to work at an optimum temperature by regulating the flow of coolant. While describing himself in the third person is not his forte, writing about any and all things automotive – is. How does the engine’s thermostat work? Basically, the thermostat regulates the temperature of water/coolant in an engine. An engine cooling system thermostat is designed to stop the flow of coolant in the cooling system when the engine is cold, this is done to help the engine warm up to optimum operating temperature which improves efficiency and emissions output. Anything that disrupts this balance of opening and closing of the thermostat valves can result in symptoms that indicate the need for proper servicing, replacement, or maintenance of the thermostat. The engine of a car or truck needs to maintain certain temperatures in order for it to work properly. How does the thermostat in a car's cooling system work? You may hear the phrase “the thermostat was stuck open or closed.” When the engine has been sitting for a while and is not warm, the thermostat will be closed. High Oil Pressure – Main Causes and Treatment, Does Your Car Make A Rattling Noise When Accelerating? This cycle repeats itself as you drive, keeping your engine at its optimal temperature for driving. The thermostat in most cars is about 2 inches (5 cm) in diameter. The fact is that for its functionality the machine must be equipped with an on-board computer. The primary valve of the thermostat remains closed, but the by-pass valve is opened, keeping the coolant circulating in the engine. As coolant flows through the engine, it picks up excess heat. The thermostat in most cars is about 2 inches (5 cm) in diameter. Including what it is, how it works, and how to tell if it’s not operating correctly. Let’s now look at a few of the most common signs that suggest your thermostat needs attention. Be the responsible car owner and take care of it throughout its lifetime. If the thermostat is not functioning correctly, the engine has no way to cool itself down. A thermostat ensures that the car's cooling system is functioning efficiently and prevents the engine from getting too hot. Once this heated coolant comes in contact with the wax-filled cylinder, it causes the wax to melt and expand. replace thermostatwhat temp thermostatis my thermostat badbad thermostat Once the engine coolant is hot enough, then the thermostat opens to allow the coolant to go to the radiator. The valves are shut tight to restrict the movement of the coolant when the engine starts. While many things can cause an engine to overheat, a faulty thermostat is one of the first things you should check. Easy guide on how an automotive cooling system thermostat works, this information pertains to most vehicles. It is a very simple yet very effective mechanism. Once the engine reaches its operating temperature (generally about 200 degrees F, 95 degrees C), the thermostat opens. A car engine works much the same way, averaging between 195-220°F. In case the engine coolant is cold, the thermostats will upkeep its locked state. The other side of the equation is an engine that’s overheating, which can be a severe issue. As soon as the engine warms up, the valves open wide, allowing the coolant to dissipate the retained heat in the radiator. In most cases, an overheating or no-heat condition in your vehicle is due to a faulty thermostat. Make sure that you obtain the correct replacement by checking the serial number on the unit. We invite you to bring your vehicle into our auto repair shop today! Engine overheats within moments of starting the car. A safe and smooth driving experience depends upon a well-functioning vehicle. The Thermostat in Your Car: A cars thermostat is a simple device that is basically a thermometer that is attached to a switch that turns on your heater. It is a fire hazard that can lead to irremediable damage to the car engine. Optional Information: 2004 Nissan mixima 3.5. Then, find and remove the radiator cap, and look inside to see if there’s any coolant flowing. Once it leaves the engine, it goes to the radiator, where that excess heat is removed. As the name suggests, it “compresses” the refrigerant so that it turns from a gaseous state into a liquid state. Any liquid-cooled car engine has a small device called the thermostat that sits between the engine and the radiator . How Do Car Thermostats Work The magic of your car thermostat is the tiny cylinder (with a rod connected to the coolant valve) placed at the engine-side. It features a unique type of wax that acts as an expanding agent. At low temperatures, the outlet to the radiator is completely blocked -- all of the coolant is recirculated back through the engine. What a Vehicle Thermostat Does. When you start you car for the first time in the morning, the engine is obviously cold and so is the coolant. By this point, the engine shouldn’t be hot enough for coolant to be necessary, so it shouldn’t be flowing. Car engines need an optimal temperature range, which is 194°F or 90°C, to function effectively. Josh Barrett is a writer hailing from the great state of Alaska. Show More. Engine shows temperature variations frequently. A faulty or broken thermostat is the most common cause of your car’s failing heat. To put it in simple words, a car thermostat works by responding to the changes in the temperature of the engine coolant. Ask Your Own Car Question. To do this you will have to fit a new transmitter unit so that the gauge can be tested against a transmitter unit that is known to work properly. A car thermostat is installed on a car engine and regulates the engine temperature by opening to allow coolant from the radiator to flow through the engine, cooling it down, then closing again to allow the engine to warm up to operating temperature. 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