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. GALANT III (E1_A)
2. GALANT III Saloon (E1_A)
3. SIGMA III (E1_A)
4. GALANT Mk III (E1_A)
5. ETERNA III (E1_A)
6. GALANT IV Saloon (E3_A)
7. GALANT IV Saloon (E3_A, HG, HH)
8. GALANT Mk IV Saloon (E3_A)
9. ETERNA IV Saloon (E3_A)
10. GALANT IV (E3_A)
11. GALANT IV (E3_A, HG, HH)
12. GALANT Mk IV (E3_A)
13. ETERNA IV (E3_A)
14. L 300 / DELICA II Bus (LO3_P/G, L0_2P)
15. EXPRESS II Bus (LO3_P/G, L0_2P, SA, SB, SC, SD, SE)
16. DELICA II Bus (LO3_P/G, L0_2P)
17. L 300 / DELICA II Van (L03_P)
18. EXPRESS II Van (L03_P, SA, SB, SC, SD, SE)
19. L 300 III Bus (P0_W, P1_W, P2_W, P3_W)
20. STARWAGON III Bus (P0_W, P1_W, P2_W, SD, SE, SF, SG, SH, SJ,
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.