Toyota 90916-03129 Thermostat

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

To address potential cooling system problems, it is crucial to conduct a series of checks before assuming the thermostat is at fault. These checks include verifying the coolant level, examining the drive belt tension, and ensuring proper operation of the temperature gauge or indicator light. If the engine exhibits a prolonged warm-up period, as indicated by the temperature gauge or heater operation, it is likely that the thermostat is stuck open, necessitating replacement with a new one. Conversely, if the engine runs hot and the lower radiator hose fails to heat up while the engine does, it suggests that the thermostat is stuck closed, preventing the coolant from circulating through the radiator. In such cases, the thermostat should be replaced. On the other hand, if the lower radiator hose is hot, it indicates that the coolant is flowing adequately, signifying an open thermostat. To remove the thermostat, begin by disconnecting the battery's negative terminal and draining the radiator coolant. Proceed by removing the alternator and detaching the thermostat housing from the engine, being prepared for coolant spillage due to the broken gasket seal. It is usually unnecessary to detach the radiator hose unless the housing itself requires replacement. Take out the thermostat while noting its installation direction, and thoroughly clean the sealing surfaces. When installing the new thermostat, ensure a new gasket is evenly fitted around it, and position the thermostat and housing with the jiggle pin at the highest point. Finally, tighten the housing fasteners according to the specified torque, reassemble the remaining components in the reverse order of removal, refill the cooling system, run the engine, and carefully inspect for any leaks or irregularities in its operation.

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.

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

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

Before assuming the thermostat is responsible for a cooling system problem, check the coolant level, drive belt tension, and temperature gauge (or light) operation. If the engine takes a long time to warm up, the thermostat is probably stuck open and should be replaced. If the engine runs hot and the lower radiator hose is not hot, the thermostat is probably stuck closed and should be replaced. If the lower radiator hose is hot, it means that the coolant is flowing and the thermostat is open. A more thorough test of the thermostat can be made when it is removed from the vehicle. If the thermostat remains in the open position at room temperature, it is faulty and must be replaced. To test it fully, suspend the closed thermostat on a length of string or wire in a container of cold water, with a thermometer. Heat the water on a stove while observing the temperature and the thermostat. Note the temperature when the thermostat begins to open and when it is fully open. Compare the temperatures to the specifications. If the thermostat doesn't open and close as specified, or sticks in any position, replace it. To replace the thermostat, disconnect the negative cable from the battery, drain the coolant from the radiator, and disconnect the radiator hose from the thermostat housing or water inlet pipe. Remove the water inlet pipe from the thermostat housing on four-cylinder models or unbolt the water inlet pipe on VS models. On V6 models, unbolt the water inlet pipe from the cylinder head. Remove the fasteners and electrical connectors from the thermostat housing and detach the housing from the engine. Remove the thermostat, clean the sealing surfaces, and fit a new gasket onto the thermostat. Install the thermostat and housing, positioning the jiggle pin at the highest point. Tighten the housing fasteners and reinstall the remaining components in the reverse order of removal. Refill the cooling system and bleed the air from the system on V6 models. Run the engine and check for leaks and proper operation.

This specific thermostat opens at around 180 degrees

Yes, this part comes with the needed gasket