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. AURIS (_E15_)
2. COROLLA (_E15_)
3. BLADE (_E15_)
4. CAMRY Saloon (_V5_)
5. COROLLA (_E12_)
6. COROLLA / ALLEX (_E12_)
7. RUNX (_E12_)
8. CAMRY Saloon (_V4_)
9. AVENSIS Saloon (_T27_)
10. AVENSIS Estate (_T27_)
11. CELICA Coupe (_T23_)
12. MR2 III (ZZW3_)
13. MR III (ZZW3_)
14. RAV 4 II (_A2_)
15. RAV 4 Mk II (_A2_)
16. RAV 4 II SUV (_A2_)
17. CAMRY Saloon (_V3_)
18. COROLLA Estate (_E12_)
19. COROLLA FIELDER Estate (_E12_)
20. COROLLA Saloon (_E12_)
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The principle of the thermostat work

The classic TOPRAN 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.