There are numerous components housed in a car's engine that are crucial for its proper operation. It opens and closes based on the temperature. It does this by regulating the amount of water that goes through the radiator. It consists of a wax-filled cylinder, two valves-main and by-pass, and a spring. When it is cold, you turn your heater on and when it is hot, you turn the air conditioner on to cool you down. (www.coldstar.co.uk) Any liquid-cooled car engine has a small device called the thermostat that sits between the engine and the radiator. How does a thermostat work? It takes a greater amount of time to warm up the engine. Answered in 20 minutes by: 2/4/2006. And since the T-stat price is only about $8, it makes more sense to replace it than to spend hours diagnosing the problem. 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. When the heat reaches a specific temperature, the agent expands, which opens the valve. The fact is that for its functionality the machine must be equipped with an on-board computer. Engine shows temperature variations frequently. No worries, because in this article, we’ll cover everything you need to know about the automotive thermostat. This is precisely how it works for your car too. A car engine works much the same way, averaging between 195-220°F. These signs can occur if: If you notice any of these symptoms, it means that your car needs thermostat repair. This expansion results in opening the primary valve, passing through which the coolant reaches the radiator and cools down, becoming ready to recirculate the engine again. One of the more obvious signs that something inside your cooling system is malfunctioning is a drop in fuel economy. Car engines need an optimal temperature range, which is 194°F or 90°C, to function effectively. Once it leaves the engine, it goes to the radiator, where that excess heat is removed. Another temperature-related symptom is fluctuations in the gauge. When the heat subsides, the agent shrinks, returning the valve to its usual closed position. Optional Information: 2004 Nissan mixima 3.5. Here's a walkthrough on how to replace a thermostat. The thermostat is one of the main components of an engine cooling system, serving to regulate the flow of coolant between the radiator and the engine. When you start you car for the first time in the morning, the engine is obviously cold and so is the coolant. The engine of a car or truck needs to maintain certain temperatures in order for it to work properly. We invite you to bring your vehicle into our auto repair shop today! This can confuse the system and cause it to display incorrect readings. The microcontroller in a digital thermostat can measure the resistance and convert that number to an actual temperature reading. Make sure that you obtain the correct replacement by checking the serial number on the unit. Josh Barrett is a writer hailing from the great state of Alaska. It is equipped with an electronic control system, thanks to which a complete and unhindered cycle of cooling ICE. "Usually located within a metal or plastic housing where the upper radiator hose connects to the engine, most of today’s thermostats utilize the "reverse poppet" design, which opens against the flow of the coolant. In most cases, an overheating or no-heat condition in your vehicle is due to a faulty thermostat. When the valve does not allow fluid to flow out of the engine, it can cause damage to the surrounding hoses, causing them to leak. Auto Mechanic: Michael, Auto Service Technician replied 13 years ago. In the engine t efficient until they ’ re warm and the radiator and cool the engine and cabin... Liquid under your car Make a Rattling Noise when Accelerating in engine performance it! 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