Genuine Toyota MR2 Cooling Fan Assembly

Toyota MR2 Cooling Fan Assembly Parts Questions & Answers

• Fan
  16361-16020
  Q: How to conduct on-vehicle tests, remove and install the engine cooling fan?

  A: 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.
• Fan
  16361-16030
  Q: How do you test, remove and install the radiator fan and related components in an MR2?

  A: MR2s without air conditioning have a single Cooling Fan Assembly on the right side. For vehicles with air conditioning, there is an additional condenser fan on the left side. The following tests apply to both fans. To test the Cooling Fan Assembly, turn the ignition key to the On position and ensure the fan is not running. If it is, check the fan relays, temperature switch, and circuit for any issues. Disconnect the electrical connector from the coolant temperature switch and the fan should come on. If it doesn't, check the fan relay, motor, ignition relay, and fuse, as well as the circuit for any short circuits. Reconnect the temperature switch connector. For a high-temperature test, start the engine and warm it above 93°C. The fan should come on when the coolant exceeds this temperature. If it doesn't, check the temperature switch. To test the temperature switch, check continuity between its two terminals with an ohmmeter while gradually heating water. There should be continuity below 83°C and no continuity above 93°C. If the switch fails either test, replace it. The fan main relay, located in the No. 5 junction block, should be tested for continuity and operation. Check continuity between specific relay terminals and ensure there is no continuity between others. Apply battery voltage across certain terminals and check for continuity between others. If the relay fails any of these tests, replace it. The No.1 fan relay, also located in the No. 5 junction block, should be tested for continuity and operation as well. Verify continuity between specific terminals and ensure there is no continuity between others. Apply battery voltage across certain terminals and check for continuity between others. If the relay fails any of these tests, replace it. To check the fan motor, disconnect the electrical connector and connect it to a hot wire and ground. The fan should come on. If it doesn't, replace the fan motor. To replace the fan motor, disconnect the battery cable, remove the cooling fan electrical connectors, remove the bolts attaching the fan shrouds to the Radiator, lower the fan/shroud assembly, remove the fan nut, remove the fan motor shaft C-clip, and remove the motor from the shroud. Installation is the reverse of removal.