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. /8 Coupe (W114)
2. COUPE (W111, W112)
3. 800 Hatchback (XS)
4. 800 (XS)
5. 800 Coupe
6. CHEROKEE (XJ)
7. WAGONEER (XJ)
8. CHEROKEE SUV (XJ)
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10. SCORPIO Mk II (GFR, GGR)
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13. SCORPIO Mk II Turnier (GNR, GGR)
14. VOYAGER / GRAND VOYAGER III (GS)
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19. GRAND CHEROKEE � (ZJ, ZG)
20. GRAND CHEROKEE I SUV (ZJ, ZG)
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The principle of the thermostat work

The classic DENSO 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.