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. MAXIMA / MAXIMA QX IV (A32)
2. MAXIMA IV Saloon (A32)
3. MAXIMA IV (A32)
4. QX IV (A32)
5. MAXIMA / MAXIMA QX V (A33)
6. MAXIMA / MAXIMA QX V Saloon (A33)
7. VEL SATIS (BJ0_)
8. ESPACE IV (JK0/1_)
9. ESPACE Mk IV (JK0/1_)
10. 350 Z Coupe (Z33)
11. FAIRLADY Z Coupe (Z33)
12. FAIRLADY 350Z Coupe (Z33)
13. 350Z Roadster (Z33)
14. FAIRLADY Z Roadster (Z33)
15. FAIRLADY 350Z Roadster (Z33)
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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.