Vehicles with 4G9 engines
Removing
1. Drain the coolant from the cooling system.
Pic. 6.4. Thermostat for cars with 4G9 engines: 1 - connection of the lower radiator hose; 2 – an inlet branch pipe of the thermostat; 3 - thermostat
2. Loosen the clamp and remove the lower radiator hose 1 (pic. 6.4).
3. Before disconnecting the lower radiator hose, mark the hose and clamp, then disconnect the hose.
4. Turn out bolts and remove an inlet branch pipe 2 of the thermostat.
5. Remove thermostat 3.
Examination
1. Immerse the thermostat in a vessel of water and heat the water while stirring it. Measure the opening temperature of the valve, which should be 82°C.
2. Measure the valve stroke at a water temperature corresponding to its full opening, the valve stroke must be at least 8 mm.
To determine the valve travel, measure the distance from the bottom of the valve to the thermostat housing when the latter is fully closed and then fully open, and then calculate the valve travel.
Installation
Installation is carried out in the reverse order of removal, taking into account the following.
Pic. 6.5. Thermostat valve position: 1 - thermostat housing; 2 - air valve; 3 - rubber ring
1. Install the thermostat so that the air valve is pointing straight up (pic. 6.5).
Attention! It is necessary to make sure that there is no oil on the thermostat sealing ring. Also, be careful not to bend or scratch the O-ring.
2. Push each hose all the way onto the fitting (including intake) cooling systems.
3. Before connecting the lower radiator hose, it is necessary to combine the marks made during disassembly on the hose and the clamp.
4. Fill in cooling liquid in the cooling system.
Vehicles with diesel engines
Removing
1. Drain the coolant from the cooling system.
2. Remove the air filter.
Pic. 6.6. Thermostat for vehicles with diesel engines: 1 – connections of heater hoses; 2 - coolant temperature sensor; 3 - clamp; 4 - gasket; 5 - bolt, 10 Nm; 6 - a bolt for removing air from the cooling system, 0.6 Nm; 7 - inlet branch pipe of the cooling system; 8 – connection of the top hose of a radiator; 9 - spacer; 10 - gasket; 11 - thermostat; 12 - connection of the lower radiator hose; 13 – connection of a hose of system of cooling; 14 - coolant temperature sensor (pointer); 15 - gasket; 16 - thermostat housing; 17 - ring gasket
3. Loosen the clamp and remove the upper hose 8 (pic. 6.6) radiator.
4. Mark the radiator hose and clamp, then disconnect the radiator hose.
5. Turn out bolts and remove an entrance branch pipe 7 of system of cooling.
6. Remove spacer 9, gasket 10 and thermostat 11.
7. Loosen the clamp and remove the hose 13 of the cooling system.
8. Loosen the clamp and remove the bottom hose 12 of the radiator.
9. Loosen the clamps and remove the heater hoses 1.
10. Turn out bolts and remove the case 16 of the thermostat.
11. Remove gasket 17.
12. Remove bolt 6 to remove air from the cooling system.
13. Get a clip 3 and remove the gauge of temperature of a cooling liquid 2 and an ring lining 4.
14. Get a clip 3 and remove the gauge 14 of temperature of a cooling liquid (pointer) and gasket 15.
Examination
Checking the thermostat is carried out in the same way as for cars with 4G9 engines.
Installation
Installation is carried out in the reverse order of removal, taking into account the following.
1. Before connecting the lower radiator hose, it is necessary to combine the marks made during disassembly on the hose and the clamp.
2. Fill the coolant into the cooling system.
3. Install the air filter.