Scion 90916-03129 Thermostat

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First of all, a detailed thermostat test can be done when removed. If it stays open at room temperature, it's faulty. To test, suspend it in cold water and heat it, noting the temperatures at which it opens and closes. If it doesn't function as specified, replace it. To replace, disconnect the battery's negative cable, drain the radiator coolant, and disconnect the radiator hose from the thermostat housing. Replace the thermostat and gasket, and reinstall everything. Refill the cooling system, bleed air from V6 models, and check for leaks and proper operation.

Do various checks, check the coolant level, and the drive-belt tension, and the temperature gauge. The previous information will help you determine if the thermostat is faulty or not. If the engine fails warm up it can be that the thermostat is stuck open but if the engine runs hot and the radiator hose does not heat up the engine may overheat. To remove the thermostat, start by detaching the battery negative terminal and draining the coolant. Detach the alternator as well as the thermostat housing from the engine. Gently remove the thermostat and clean the sealing area. Install the housing, refill the cooling system, run the engine, and check for any leaks. Once you complete the replacement procedure, You should feel the radiator hose and if it is warm, that means that the coolant is flowing properly.

Drain the engine coolant. Disconnect the radiator hose from the thermostat housing or water inlet pipe.

The coolant level, drivebelt tension, and temperature gauge or light operation should be checked.

Remove the battery and battery tray on Lexus models.

If the engine runs hot and the lower radiator hose is not hot, it indicates that the thermostat is probably stuck in the closed position and should be replaced.

The first step is to disconnect the cable from the negative battery terminal and drain the cooling system.

If the engine takes a long time to warm up, it is likely that the thermostat is stuck open and should be replaced.

This specific thermostat opens at around 180 degrees

Yes, this part comes with the needed gasket