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. PUNTO EVO (199_)
2. QUBO (225_)
3. DOBLO Box Body/MPV (223_)
4. DOBLO MONOCAB (223_)
5. GRANDE PUNTO (199_)
6. PUNTO (199_)
7. PUNTO Hatchback Van (199_)
8. CORSA D Hatchback Van (S07)
9. ASTRA H Estate Van (L70)
10. ASTRA H Van (L70)
11. DOBLO Platform/Chassis (263_)
12. PRATICO Platform/Chassis (263_)
13. IDEA (350_)
14. ASTRA H (A04)
15. ASTRA Mk V (H) (A04)
16. ASTRA H Estate (A04)
17. ASTRA Mk V (H) Estate (A04)
18. DOBLO MPV (119_, 223_)
19. ASTRA H GTC (A04)
20. CORSA D (S07)
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.