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 (_P9_)
2. YARIS/VITZ (_P9_)
3. VITZ (_P9_)
4. CHARADE
5. JUSTY IV
6. SIRION (M1)
7. STORIA (M1)
8. TERIOS (J1_)
9. TARUNA (J1_)
10. YRV (M2)
11. YRV MPV (M2)
12. YARIS (_P1_)
13. ECHO (_P1_)
14. YARIS/VITZ (_P1_)
15. VITZ/ECHO (_P1_)
16. EXTOL Bus (S22_, S23_)
17. EXTOL MPV (S22_, S23_)
18. Atrai Bus (S22_, S23_)
19. SIRION (M3_)
20. BOON (M3_)
21. See more in applications

The principle of the thermostat work

The classic METZGER 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.