Toyota 90916-03052 Thermostat

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Before assuming the thermostat is responsible for a cooling system problem, check the coolant level, drivebelt tension, and temperature gauge (or light) operation. If the engine takes a long time to warm up, the thermostat is probably stuck open. Replace the thermostat with a new one. If the engine runs hot, use your hand to check the temperature of the lower radiator hose. If the hose is not hot, but the engine is, the thermostat is probably stuck in the closed position, preventing the coolant inside the engine from traveling through the radiator. Replace the thermostat. Caution: On models equipped with fuel injection, do not drive the vehicle without a thermostat. The computer may stay in open loop and emissions and fuel economy will suffer. If the lower radiator hose is hot, it means that the coolant is flowing and the thermostat is open. To replace the thermostat, disconnect the negative cable from the battery. Drain the cooling system. If equipped, disconnect the vacuum hoses to the BVSV on the thermostat housing. Detach the housing from the engine, being prepared for some coolant to spill. Remove the thermostat, noting the direction in which it was installed in the housing, and thoroughly clean the sealing surfaces. Install a new gasket onto the thermostat or housing, making sure it is evenly fitted all the way around. Install the thermostat and housing, positioning the jiggle pin, if equipped, at the highest point. Tighten the housing fasteners to the torque and reinstall the remaining components in the reverse order of removal. Refill the cooling system, run the engine, and check for leaks and proper operation.