Question about Toyota Previa

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Toyota Ipsum/Picnic, 1997, 2L, 3S-FE. Radiator cooling fan stays on all the time. 2nd cooling fan for air con. also was staying on, but has since stopped working. Problem is probably there since I bought the car but not noticed 'cause I thought the a.c. compressor sound was the fan coming on. Kieran.

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  • kieraneh Jul 27, 2009

    The cooling fan is on all the time. When the ignition is on the fan is on.

  • kieraneh Jul 29, 2009

    Sorry for delay-had toget relay. Unfortunately no joy.

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  • Master
  • 2,187 Answers

Hi There,

The problem for the fans may or may not be related. For the radiator fan, the signal to turn it off comes from the temperature sensor at the lower radiator hose. You should see wires going to a plug which is the sensor itself. The sensor may not be sending signal or the terminals may be bent or dirty. Pulling out the plug will normally turn on the fan continuously.

For the AC fan, it should be on when the AC is on. If it is on all the time whether the AC is on or not, it could be a wiring issue. You can trace the wire of the fan from the front to a small black box at the engine bay which should contain the relay of both fans. Check if pulling out the relays would stop the issue, if it does it could be faulty relays or the plugs for the relays may have a problem. If not you may have to check the wiring. Check for open wiring that may cause the delivery of power to the fans bypassing the sensors and the switches.

Posted on Jul 30, 2009

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  • Master
  • 6,784 Answers

HI. you will need to preform a test on the fans to confirm the issue. i suggest using the procedure below.


Step1
Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail or become erratic.
Step2
Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow.
Step3
Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector.
Step4
Locate the heat-sensitive switch or heating sensor if the fan motor operates with direct voltage and the test light did not glow. You should find the sensor in the radiator, engine block, or thermostat housing.
Step5
Measure the resistance across the heating sensor with the multimeter. With the engine at cool temperature (engine off), it should register infinite resistance; with the engine at warm temperature (engine off), you should read low resistance. If both readings state infinite resistance install a new heating sensor, that’s the cause of your failing fan.
Step6
Check the action of the fan relay if the heating sensor is registering variable resistance. Your service manual should specify the power and ground wires according to color codes and the proper way to test it. If the fan relay fails the test replace it with a new one.
Step7
Check the connections going to the ECM after you determine the fan relay is working properly. If you find broken wires or loose connectors, make the necessary repairs. If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.

Posted on Jul 27, 2009

  • Michael Masters
    Michael Masters Jul 27, 2009

    Most common issue here will be a faulty relay(stuck closed)

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  • Toyota Master
  • 75,077 Answers

Replace the cooling fan realy, it is located in the underhood fuse box, it should be marked, since this is not a USA model the exact location of the relay in the box is not avail to me but it should be listed in the box or in the owners manual

Posted on Jul 27, 2009

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