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A car engine is designed to work at a specific temperature. When an engine is too cold, combustion is less effective, creating more pollution. Cold motor oil makes lubrication difficult, causing more wear and more friction losses.

An engine should not get too hot either. Certain parts may deform, rubbers seals may harden and cause oil leaks, pistons may seize in their cylinders and as oil gets too hot and too thin, the lubrication film weakens. Oil may even oxidize and clog oil passages. And of course, water may boil away, rendering the cooling system ineffective.

To keep the engine temperature within range, cars engines are equipped with a thermostat. The thermostat will block the water flow to the cooler until the engine is warm, then the thermostat will open gradually as temperature rises, thus regulating the coolant flow and keeping the temperature at a constant level.

Most thermostats use a wax cartridge, which expands as temperature rises and the wax begins to melt, which is usually around 80° Celsius. The expanding cartridge opens a valve against a spring force, thus releasing coolant to the radiator.

If an engine has trouble getting to its working temperature or if an engine runs hot, there's a good chance the thermostat is failing and should be replaced. Of course, it is essential that the replacement part has the same opening size and temperature as the original part, to keep the engine within the temperature range it is designed for.

Nipparts offers a very wide range of dedicated thermostats for Japanese and Korean cars. Nipparts thermostats are made to OE specifications and offer the same quality as the original parts, but at a more affordable price.

Nipparts Thermostats
  • Accurate temperature control
  • Long service life
  • Made to OE specifications
  • OE matching quality
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