Question 1

How to Conduct On-Vehicle Tests, Remove, and Install the Engine Cooling Fan Assembly on Toyota MR2?

Accepted Answer

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.

Question 2

How to troubleshoot a Cooling Fan Assembly that won't shut off when the engine is cool on 1997 through 2001 Toyota Solara?

Accepted Answer

You can fix the radiator fan problem on these models by disconnecting the wiring connector from the coolant temperature switch(es) and bridging the connector; if this switches off the fan, replace the switch. Check the number 1 ECT switch with an ohmmeter to see if it works: connect when engine temperature is below 190 degrees F, but not when it's hotter than 208 degrees F. A good ECT number 2 switch should give no connection below 181 F when you test it with an ohmmeter and provide voltage when the engine reaches 190 F or higher; replace the faulty switch. To see if the fan motor isn't working, starts by checking the fuses and links. Then bridge the motor circuit with jumper wires attached to the battery, but fuse them. If the fan still isn't moving, you need to buy a new fan motor. The motor might not work because one of these systems: the relays, wiring, or the cooling fan's computer. The main relay container you need to access is inside the driver-area of the engine compartment - models with air-conditioning have a cooling fan relay number 2, but not all 3s do. Check the cooling fan's first relay by unplugging it and using an ohmmeter to measure if the current flows through terminals 1 and 2, and between 3 and 4. Also ensure there's no electricity between 3 and 4 when you put battery voltage at terminal 1 and 2. Check the fan connections to make sure they work properly. If so, disconnect the main engine relay and test its circuits: tens 3 and 5 should have connectivity, while terminals 2 and 4 should not. Measuiring 3 and 5 with a battery voltage should show connectivity between pins 1 and 2, and no connectivity between 2 and 4. Taking the car to a dealer or trained repair shop for more checks is needed after all relays show good results. You need to disconnect three parts before you can remove the fan: the negative battery cable, the wiring connector at the fan motor, and the cruise control actuator wire if you have one on your fan shroud. Take off the fan/shroud from around the radiator, then pull it up and out. First take off the top fan (number 2) if required. Loosen the fan motor bolts from the fan holder, remove the retaining parts, and pull the fan free from its bracket. To install back the fan, follow these same steps reversed, installing a new retaining clip for blade to fan motor pair number 2 and soaking the O-ring in soapy water if you replace fan switch.

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