THERMOSTAT COOLANT FOR VW GOLF/PLUS/VI/IV/Mk POLO/CLASSIC FLIGHT DERBY PASSAT VEMO V42-99-0001

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. 205 I (741A/C)
2. 205 � (741A/C)
3. ASCONA A (81_, 86_, 87_, 88_)
4. 1900 A (81_, 86_, 87_, 88_)
5. ASCONA B (81_, 86_, 87_, 88_)
6. MANTA A (58_, 59_)
7. SUPER 5 (B/C40_)
8. 11 (B/C37_)
9. ENCORE (B/C37_)
10. 14 (121_)
11. 19 I (B/C53_)
12. 19 � (B/C53_)
13. 19 I Chamade (L53_)
14. 19 � Chamade (L53_)
15. 19 II Chamade (L53_)
16. 19 Mk II Chamade (L53_)
17. 19 II (B/C53_)
18. 19 Mk II (B/C53_)
19. 19 II Cabriolet (D53_, 853_)
20. 19 Mk II Cabriolet (D53_, 853_)
21. See more in applications

The principle of the thermostat work

The classic VEMO 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.