Lexus 90916-03084 Engine Coolant Thermostat

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Before assuming the thermostat is the cause of a cooling system issue, perform a general check by examining the coolant level, drive belt tension, and temperature gauge or light operation. If the engine takes a long time to warm up or the thermostat is stuck open, replace it with a new one. To further test the thermostat, remove it from the vehicle and suspend it in cold water using a string or wire. Heat the water while observing the thermostat and note the temperature at which it begins to open and when it is fully open. Compare these temperatures to the specifications. If the thermostat fails to open or close as specified, or if it sticks in any position, it should be replaced. To remove the thermostat, disconnect the negative battery cable, drain the coolant, and detach the radiator hose or water inlet pipe. Remove the water inlet pipe on four-cylinder models or unbolt it on V6 models. Remove the fasteners and electrical connectors from the thermostat housing, detach the housing from the engine, and remove the thermostat while noting its installation direction. Clean the sealing surfaces thoroughly. During installation, ensure a new gasket is evenly fitted onto the thermostat, position the thermostat and housing with the jiggle pin at the highest point, tighten the housing fasteners to the specified torque, and reinstall the remaining components in reverse order. Refill the cooling system and, for V6 models, bleed any air from the system. Run the engine, check for leaks, and verify proper operation.

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

USE GASKET 16325-62010