Question about 2002 Toyota ECHO

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Radiator fan The radiator fan is only turning what the air conditioner on. With the air conditioner off even if the overheating light comes on the fan won't crank up. In 110° whether or what the air-conditioning on in Vegas it does not overheat.

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  • louwho4052 Nov 27, 2008

    My mechanic friend has not had time to check your solution to the problem. Please forgive the length of time it has taken me to get back to you on this. I've been trying to find a wiring diagram of the fan radiator system etc. with no luck. It's Las Vegas winter now so the urgency has passed.

    I'll make one more attempt to find a wiring diagram without getting ripped off at the dealership. And you have my word I'll get back to you and thanks for your help. Lou

  • larrybdl Dec 31, 2008

    i have a similar problem, could you send me the wiring diagram?. larrybdl@htva.net. thanks larry

  • Graham Core May 11, 2010

    engine temperature sensor or called coolant temp switch

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  • Toyota Master
  • 1,861 Answers

You should check the 30 amp "RDI" fuse and the 7.5 ECU-IG fuse. Both fuses are critical to the operation of the fan system. The RDI fuse sends power to the fan #1 relay. The A/C amplifier turns on power to the fan #1 relay, this is why your fan works on A/C.

Now, with no cooling fan under "normal conditions" (A/C off), you need to have a good fan #2 relay, and a good water temp switch. This switch is on the engine, near the thermostat housing (I think); with a single plug, with a white with a blue trace wire going to it. Remove this wire from the sender, and jump it to ground (anywhere on the metal of the engine) with the key on (engine OFF). If the fan starts, you need a new water temp sending unit. If not, then consider a new fan #2 relay. This system is pretty simple.

Posted on Sep 24, 2008

  • Toyota Ed Nov 28, 2008

    If you want a wiring diagram, I will be glad to provide you with one. Please post your e-mail address.

  • llzoomzoomll May 13, 2011

    I know this is much later than when you actually posted this. I have a question about my 2000 Toyota Echo. I have both a water temp switch and a radiator fan switch (located on the bottom part of the radiator). Is there a way I can test those to see if they work. I jumped my fan and it works fine, but I cant figure out if its my relay(s) thats bad or my switches. Thanks!

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