THERMOSTAT COOLANT FOR VW POLO/CLASSIC/Hatchback/Van DERBY GOLF/II/Mk RABBIT 50 GATES TH00391G2

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. SCORPIO I (GAE, GGE)
2. GRANADA Mk III� (GAE, GGE)
3. GRANADA I (GAE, GGE)
4. 50 (86)
5. 80 (81, 85, B2)
6. 80 Saloon (81, 85, B2)
7. 4000 (81, 85, B2)
8. POLO (86)
9. DERBY (86)
10. POLO (86C, 80)
11. DERBY (86C, 80)
12. GOLF I (17)
13. RABBIT I (17)
14. GOLF � (17)
15. CARIBE I (17)
16. JETTA I (16)
17. JETTA I Saloon (16)
18. ATLANTIC I (16)
19. GOLF II (19E, 1G1)
20. GOLF Mk II (19E, 1G1)
21. See more in applications

The principle of the thermostat work

The classic GATES 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.