Thermostat with solid filler, two-valve, type TS-107-04, is located in the outlet pipe of the cylinder head and is connected by hoses to the coolant pump and radiator
The main thermostat valve begins to open at a coolant temperature of 84-87 ° C.
At a temperature of 94 ° C, it is already fully open.
When the main valve is closed, the liquid in the engine cooling system circulates, bypassing the radiator, through the open additional thermostat valve inside the engine cooling jacket.
When the main valve is fully open, the additional valve is closed and all the liquid passes through the cooling radiator.
Thermostat parts: 1, 8, 10 – bolts; 2, 9, 11 – washers; 3 – plug; 4, 14 – gaskets; 5 – clamp; 6 – hose; 7 – fitting; 12 – housing; 13 – thermostat; 15 – cover
The body heater is connected in parallel with the radiator, and the thermostat does not disconnect it from the engine. Therefore, when warming up the engine, do not open the air intake flap or turn on the heater electric motor.
The thermostat automatically maintains the required temperature of the coolant in the engine by turning off and on the circulation of liquid through the radiator.
In cold weather, especially at low engine loads, almost all the heat is removed as a result of blowing cold air over the engine, and the coolant does not circulate through the radiator.
To maintain the optimal temperature of the engine at negative ambient temperatures, it is necessary to cover the radiator lining with a cover.
To check or replace the thermostat, you need to:
Drain about 5 liters of liquid from the radiator of the cooling system into a pre-prepared container.
Loosen the hose clamp.
Disconnect the liquid supply hose.
Unscrew the four bolts securing the top cover of the thermostat housing.
Remove the thermostat from the housing.
Assembly is carried out in the reverse order.
The thermostat must be cleaned of scale in boiling 8-10% alkaline solution for 15-20 minutes, and then rinsed with clean water.
The temperature at the moment of the beginning of the opening of the thermostat valve, placed in gradually heated water, should be 84°-87 ° C, and at the moment of the full opening of the valve 91°-95° C the lifting height of the fully open valve is not less than 8.5 mm.
The thermostat valve in the closed position should fit tightly to the seat; the permissible gap between the valve and the seat is 0.1 mm.
The valve displacement relative to the neck is allowed no more than 0.5 mm.