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. COLT II (C1_A)
2. COLT II (C1_A, RB, RC)
3. COLT Mk II (C1_A)
4. LANCER III (C1_A, C6_A)
5. COLT III Saloon (C1_A, C6_A, RD, RE)
6. LANCER Mk III (C1_A, C6_A)
7. LANCER III Station Wagon (C1_V, C3_V)
8. LANCER III Break (C1_V, C3_V)
9. LANCER Mk III Station Wagon (C1_V, C3_V)
10. GALANT III (E1_A)
11. GALANT III Saloon (E1_A)
12. SIGMA III (E1_A)
13. GALANT Mk III (E1_A)
14. ETERNA III (E1_A)
15. GALANT IV Saloon (E3_A)
16. GALANT IV Saloon (E3_A, HG, HH)
17. GALANT Mk IV Saloon (E3_A)
18. ETERNA IV Saloon (E3_A)
19. GALANT IV (E3_A)
20. GALANT IV (E3_A, HG, HH)
21. See more in applications

The principle of the thermostat work

The classic VALEO 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.