Scion 90916-03093 Thermostat

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The thermostat in a cooling system can become slow to react or stick in the open or closed position as it ages. This can cause issues like slow warm-up or rapid overheating. Before assuming the thermostat is the problem, check the coolant level and ensure there are no airlocks. If the engine takes a long time to warm up or the temperature gauge is inaccurate, the thermostat may be stuck open or missing. If the engine runs hot and the radiator top hose is not hot, the thermostat is likely stuck closed and needs replacing. To test the thermostat, start the engine and monitor the temperature of the radiator top hose. If it remains cold and then quickly warms up, the thermostat is working. If not, remove and test the thermostat by heating it in water. If it fails or sticks, replace it. Use a new O-ring and tighten the cover nut/bolt to the specified torque when refitting. Refill the cooling system.

Before assuming the thermostat is the cause of a cooling system problem, it is important to perform a thorough check. Verify the coolant level, drive belt tension, and the operation of the temperature gauge or light. If the engine takes a long time to warm up, indicating a stuck-open thermostat, it should be replaced with a new one. In case the engine runs hot and the right (passenger's side) radiator hose is not hot while the engine is, it suggests a closed thermostat preventing coolant flow to the radiator. In this situation, replacing the thermostat is necessary. Conversely, if the hose is hot, it signifies that the coolant is flowing and the thermostat is open. For the thermostat replacement, start by removing the radiator cover and plastic lower engine covers for 2004 through 2009 models. Drain the coolant from the radiator. On 2010 and later models, disconnect the coolant hose from the inlet air filter, detach the wiring harness clamp, and remove the inlet air filter assembly by removing three bolts and the dipstick tube for clearance. Detach the thermostat housing from the engine, being prepared for some coolant spillage as the gasket seal is broken. The radiator hose can remain attached unless the housing itself needs replacement. Remove the thermostat, noting its installation direction, and thoroughly clean the sealing surfaces. During installation, fit a new gasket evenly onto the thermostat, ensuring proper alignment. Install the thermostat and housing, positioning the jiggle pin at the highest point. Tighten the housing fasteners to the specified torque, and then reinstall the remaining components in the reverse order of removal. Refill the cooling system, start the engine, and check for any leaks or issues with the system's operation.

The thermostat in a cooling system can become slow to react or stick in the open or closed position as it ages. This can cause issues like slow warm-up or rapid overheating. Before assuming the thermostat is the problem, check the coolant level and ensure there are no airlocks. If the engine takes a long time to warm up or the temperature gauge is inaccurate, the thermostat may be stuck open or missing. If the engine runs hot and the radiator top hose is not hot, the thermostat is likely stuck closed and needs replacing. To test the thermostat, start the engine and monitor the temperature of the radiator top hose. If it remains cold and then quickly warms up, the thermostat is working. If not, remove and test the thermostat by heating it in water. If it fails or sticks, replace it. Use a new O-ring and tighten the cover nut/bolt to the specified torque when refitting. Refill the cooling system.

Before replacing a thermostat, it's crucial to check the coolant level, drive belt tension, and temperature gauge operation. If the engine takes too long to warm up, or if it overheats while the lower radiator hose stays cool, it indicates the thermostat is stuck open or closed. If the lower radiator hose is hot, the thermostat is functioning correctly. Overheating might also point to other issues like cylinder head leaks. Replace the faulty thermostat, disconnect the negative battery terminal, drain the cooling system, and remove the engine cover if it's a V6. Detach the thermostat housing from the engine, prepare for coolant spillage, and remove the thermostat, noting its orientation. Clean the sealing surfaces thoroughly. For a new thermostat installation, attach a new gasket (four-cylinder engines) or O-ring (V6 engines). Ensure the thermostat is correctly positioned with the jiggle pin at the top for four-cylinder models. Reinstall the thermostat housing with a new gasket for four-cylinder engines, and tighten it to the required torque. Reassemble the rest of the components in reverse order, refill the cooling system, start the engine, and check for any leaks or operational issues.

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