Thermostat is a device for maintaining a static (constant) temperature, as its name implies. There are thermostats of different designs in many devices and mechanisms, from water heaters to refrigerators. There is also a thermostat in a car's internal combustion engine (liquid-cooled, of course). In a car, the thermostat regulates the temperature of the coolant (antifreeze): it accelerates the warm-up of a cold engine and provides heat removal from the hot one. Therefore, the engine works more efficiently and more comfortably for the driver, especially in winter - without a thermostat, the stove would usually blew cold air.

1. YARIS / VIOS Saloon (_P9_)
2. YARIS Saloon (_P9_)
3. BELTA Saloon (_P9_)
4. VIOS Saloon (_P9_)
5. HIACE IV Bus (_H1_)
6. REGIUS IV Bus (_H1_)
7. HIACE IV MPV (_H1_)
8. DYNA IV Bus (_H1_)
9. HIACE / COMMUTER IV Bus (_H1_)
10. QUANTUM IV Bus (_H1_)
11. SUPRA (_A8_)
12. YARIS (_P9_)
13. YARIS/VITZ (_P9_)
14. VITZ (_P9_)
15. HIACE IV Van (_H1_)
16. GS (JZS147_)
17. GS Saloon (JZS147_)
18. GS (_S16_)
19. GS Saloon (_S16_)
20. LAND CRUISER PRADO (_J15_)
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The principle of the thermostat work

The classic HOFFER brand Thermostat, coolant is a movable valve that moves due to a change in the external environment - heating or cooling of antifreeze. The thermostat is made of a thermoelement filled with a substance resembling wax in structure - ceresin, with the addition of copper powder, graphite or aluminum for better thermal conductivity. At a certain temperature of the antifreeze, ceresin expands, opening the thermostat valve. When the motor cools down, ceresin contracts and the thermostat closes again.