Contents: Examination ↓ Replacement ↓
Engine thermostat 1FZ-FE
1. Thermostat
2. Gasket
3. Inlet pipe
Warning! Work is carried out on a cold engine in compliance with safety measures (antifreeze is poisonous).
Examination
1. Before concluding that the thermostat is faulty, check the fluid level, the condition of the pump belt and the serviceability of the temperature gauge (or a control lamp).
2. If the engine takes a long time to warm up (this can be determined by the slow increase in temperature on the indicator, or by the slow heating of the air by the heater), then the probable cause is the thermostat valve sticking. In this case, replace the thermostat.
3. If the engine overheats, check the temperature of the upper radiator hose. If the hose is warm and the engine is hot, the thermostat is closed, blocking the flow of fluid from the engine to the radiator. Replace the thermostat.
Attention! Driving without a thermostat is prohibited on cars with an injection engine. Without a thermostat, the feedback circuit of the automatic control of the toxicity reduction systems and the fuel system is broken, resulting in a decrease in engine efficiency.
Replacement
1. Disconnect the battery from ground and drain the fluid.
2. Disconnect the vacuum hoses from the thermostat (if provided).
3. Remove the thermostat housing; the hose does not need to be disconnected from the housing.
4. Remove the thermostat, paying attention to its orientation (thermostat spring facing the engine).
5. Carefully remove the old seal.
6. Replace the gasket (since 1993, the gasket has been placed along the edge of the thermostat and is a sealing ring with a groove), orient and install the thermostat.
7. Tighten the bolts.
8. Fill with fluid, start the engine and check for leaks.
(The original can be found on this resource: «toyotaman.ru»)