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. LANCER IV Hatchback (C6_A, C7_A)
2. LANCER IV Hatchback (C6_A, C7_A, CA, CB)
3. LANCER Mk IV Hatchback (C6_A, C7_A)
4. COLT IV (CA_A)
5. COLT Mk IV (CA_A)
6. SPACE WAGON (N3_W, N4_W)
7. NIMBUS (N3_W, N4_W, UF)
8. EXPO (N3_W, N4_W)
9. CHARIOT (N3_W, N4_W)
10. GALANT V Saloon (E5_A, E7_A, E8_A)
11. GALANT Mk V Saloon (E5_A, E7_A, E8_A)
12. ETERNA V Saloon (E5_A, E7_A, E8_A)
13. GALANT V (E5_A, E7_A, E8_A)
14. GALANT V (E5_A, E7_A, E8_A, HJ)
15. GALANT Mk V (E5_A, E7_A, E8_A)
16. LANCER V (CB_A, CD_A, CE_A)
17. LANCER V Saloon (CB_A, CC, CD_A, CE_A)
18. LANCER Mk V (CB_A, CD_A, CE_A)
19. LIBERO V (CB_A, CD_A, CE_A)
20. PAJERO II (V3_W, V2_W, V4_W)
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.