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. CLIO II (BB_, CB_)
2. CLIO Mk II (BB_, CB_)
3. LUTECIA II (BB_, CB_)
4. CLIO MIO II (BB_, CB_)
5. ESPACE III (JE0_)
6. ESPACE Mk III (JE0_)
7. LAGUNA II (BG0/1_)
8. LAGUNA II Grandtour (KG0/1_)
9. LAGUNA II Sport Tourer (KG0/1_)
10. MASTER II Bus (JD)
11. MASTER II Van (FD)
12. MASTER II Platform/Chassis (ED/HD/UD)
13. VEL SATIS (BJ0_)
14. ESPACE IV (JK0/1_)
15. ESPACE Mk IV (JK0/1_)
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The principle of the thermostat work

The classic HOFFER 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.