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. 25 (B29_)
2. ESPACE II (J/S63_)
3. ESPACE Mk II (J/S63_)
4. SAFRANE I (B54_)
5. SAFRANE � (B54_)
6. LAGUNA I (B56_, 556_)
7. LAGUNA I Grandtour (K56_)
8. LAGUNA I Nevada (K56_)
9. LAGUNA I Estate (K56_)
10. ESPACE III (JE0_)
11. ESPACE Mk III (JE0_)
12. SAFRANE II (B54_)
13. SAFRANE Mk II (B54_)
14. 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.