Thermostat, coolant - 820771 VALEO

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. L 300 III Van (P0_V, P1_V, P_2V)
2. EXPRESS III Van (SF, SG, SH, SJ, WA, P0_V, P1_V, P_2V)
3. DELICA III Van (P0_V, P1_V, P_2V)
4. L 300 III Bus (P0_W, P1_W, P2_W, P3_W)
5. STARWAGON III Bus (P0_W, P1_W, P2_W, SD, SE, SF, SG, SH, SJ,
6. DELICA III Bus (P0_W, P1_W, P2_W, P3_W)
7. L200 (K3_T, K2_T, K1_T, K0_T)
8. TRITON Pickup (K3_T, K2_T, K1_T, K0_T, ME, MF, MG, MH, MJ)
9. MIGHTY MAX (K3_T, K2_T, K1_T, K0_T)
10. L200 / STORM (K3_T, K2_T, K1_T, K0_T)
11. MIGHTY MAX SUV (K3_T, K2_T, K1_T, K0_T)
12. TRANSIT Bus (72E, 73E)
13. L200 (K7_T, K6_T)
14. TRITON Pickup (K7_T, K6_T, MK)
15. L200 (K7_T, K6_T, K34T)
16. L200 / STORM (K7_T, K6_T)
17. STORM SUV (K7_T, K6_T)
18. STRAKER (K7_T, K6_T)
19. STRADA (K7_T, K6_T)
20. COLT / RODEO (K7_T, K6_T)
21. 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.