Toyota 16361-16020 Fan

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To conduct on-vehicle tests for the cooling fan assembly, begin by turning on the ignition switch and ensuring that the fan is not running; troubleshoot any issues related to the fan relay, temperature sensor, or circuit if it is running. Disconnect the temperature sensor connector, and the fan should activate; if not, check various components like the fan relay, motor, temperature sensor, and cooling fan computer. Reconnect the temperature sensor connector. For a high-temperature test, start the engine and raise its temperature above 80°C (176°F) to observe fan operation; if the fan doesn't operate, test the temperature sensor's functionality. To test the temperature sensor, use an ohmmeter and measure its resistance as it's gradually heated; it should meet specified resistance values at different temperatures. If it fails these tests, replace it. For the engine main relay, located in the No. 2 junction block, test continuity and operation using specific terminals; replace it if it fails any of these tests. Similarly, test the vent fan relay, located in the same junction block, for continuity and operation. If either relay fails these checks, replace it. To ensure the fan motor functions, connect the battery directly to its connector; if it doesn't operate, replace the fan motor. For fan assembly replacement, disconnect the electrical connector and remove bolts and washers securing the fan assembly. Remove the fan nut, the fan, and the fan motor. Reverse these steps for assembly and installation.

To test the radiator fan, turn the ignition key to the On position and ensure the fan is not running. If it's running when it shouldn't be, check the fan relays, temperature switch, and circuit for any issues.