Contents: Examination ↓ Replacement ↓
Examination
If there are any defects in the cooling system, check the coolant level and the functionality of the temperature gauge.
1. If the engine warms up very slowly after starting, the thermostat may be permanently open and needs to be replaced.
2. If the engine overheats, check the temperature of the upper radiator hose with your hand. If the hose is cold, then the thermostat may be in the closed position and not allowing coolant to pass to the radiator. In this case, the thermostat must also be replaced.
3. If the thermostat is in the open position at room temperature, it must be replaced.
4. To test the thermostat, lower it by a string into a container of water. Gradually heat the water and note the temperature at which the thermostat begins to open and opens completely. Remove the thermostat from the water and check that it closes completely after cooling. Replace the thermostat if its parameters deviate from the technical requirements.
Replacement
Thermostat and water pump location on 3VZ-FE V6 engines
1 – water supply pipe; 2 – O-ring round section; 3 – thermostat cover; 4 – sealing ring; 5 – thermostat; 6 – water pump
1. Remove the ground cable from the battery.
Warning: If your radio has an anti-theft code, make sure you have the connection codes before disconnecting the battery.
Caution! On models from 1993 onwards, the airbag system is disabled if the battery is disconnected for an extended period of time. If the airbag warning light comes on and remains on after the battery is reconnected, contact a specialist workshop to restore the system to working order.
2. Drain the coolant from the radiator.
3. On four-cylinder engines, remove the water supply hose from the radiator, which is located on the water pump housing. Remove the oil filter to access the hose mounting bolts.
4. On V6 models, unscrew the water inlet pipe mounting bolt and remove the pipe together with the sealing ring (see fig. Location of thermostat and water pump on 3VZ-FE V6 engines).
5. Disconnect the electrical connectors from the thermostat housing and remove the thermostat housing from the engine. To improve access to the thermostat housing on the 1MZ-FE engine, remove the air cleaner housing and hoses.
6. Remove the thermostat, noting the position in which it was installed.
7. Install a new gasket on the thermostat.
(The original can be viewed on the website: ToyotaMan.ru)
8. Install the thermostat into the housing.
9. Install the thermostat housing onto the cylinder block and secure with bolts.
10. Fill the engine cooling system with coolant.