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The engine needs to warm up first before getting into action, just like your body before exercising. It needs to warm up. The thermostat controls the engine's warm-up period. As the car thermostat allows it to heat up quickly, it keeps the engine temperature at a fixed degree.
Located between the engine and the radiator, this little temperature-sensitive spring valve stays closed during engine warm-up, preventing coolant from leaving the engine and circulating through the radiator until the correct running temperature is achieved. Once the temperature of the coolant rises to between 180 and 195 F (82-91 C), the car thermostat starts to open, allowing fluid to go through the radiator to be cooled. And by the time the coolant reaches 200 to 218 F (93-103 C), the auto thermostat is open all the way.
The trick of the auto thermostat lies in the tiny cylinder at the engine-side of the device. The cylinder is filled with a wax that usually starts to melt at 180 F. A rod connected to the valve presses into this wax. And as the wax melts, it expands, pushing the rod out of the straw. This process is also used in automatic openers for greenhouse vents and skylights.
Various engines use different auto thermostats. There are some high-ranging thermostats that maintain engine operating temperatures above 2,000 F. This causes the engine to burn up more pollutants and helps in emissions control. The range for a specific auto thermostat depends on the type of the engine, load requirements, weather, and other factors. Most of the auto thermostats are "pellet type" - the name comes from the wax pellet that expands as the engine coolant warms. This expansion forces the valve to open. Auto thermostats usually get "stuck shut" as it cuts off its cooling capacity of the radiator. It often occurs after an engine has overheated because of water pump failure or a developing coolant leakage. So it is important to have your thermostat checked to avoid engine overheat, engine wear and excessive waste fuel.

Thermostat Articles

  • Thermostat: Just the Facts 21 December 2012

    Among the crucial components of every liquid-cooled engine vehicle is the thermostat. Positioned between the engine and the radiator, the thermostat prevents coolant flow to the radiator until the engine warms up. Usually, the thermostat allows the coolant to flow to the engine when its operating temperature reaches about 200 degrees Fahrenheit or 95 degrees Celsius. By initially keeping coolant out of the engine, the thermostat helps the engine warm up more quickly. In turn, your vehicle gets to avoid premature engine wear and excess emissions. However, just like other components in the cooling system, the thermostat will eventually need to be replaced. Luckily, you can get an affordable topnotch replacement unit right here at Auto Parts Deal. Here, shopping is definitely easier and more convenient.


    • The thermostat also keeps engine temperature stable; as engine temperature climbs, the thermostat feeds the engine more coolant.

    • Our thermostats are made from premium stainless steel for durability.

    • A thermostat from us comes with self-cleaning and self-aligning thermostat valve.

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  • Important Facts You Need to Know About Thermostat 10 October 2012

    Don't have a clue whether your car is carrying the right temperature? Stay up-to-date by getting your ride a dependable Thermostat at once.
    Still postponing important meetings because of your stubbornly overheating engine? Before you open your hood and replace random equipment-like your blameless radiator for instance-take a few minutes to carefully inspect what's really going on under your hood. If the problem isn't with your radiator or its connections, then you definitely have a busted Thermostat in your ride.
    Your car's Thermostat helps keep your engine's operating temperature below the overheating level. It regulates the amount of coolant that circulates in your engine system. Each time your engine heats up, this thermometer-like valve opens up and allows coolant to enter your radiator and flow through your engine system. When not in use, this part remains closed. When your car easily overheats, then there's a problem with your thermostat wiring or the device itself. This indicates that the valve is stuck in a closed position. A sudden drop in your car's fuel efficiency and a check engine light that remains lit throughout your travels are also signs of thermostat trouble. The moment you encounter these problems, check the thermostat to see if it's stuck and replace it immediately.
    To replace this auto component, drain your cooling system first. Then remove all the connections to your thermostat housing before removing the thermostat from your engine to avoid damaging the thermostat wiring. It's also highly advised that you replace the housing gasket before you reassemble everything and fill your slosh tank with new coolant. Get a new thermostat and start your replacement task now.

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