Question about Toyota Supra

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How can I find out if the auxiliary fan is bad or just has a bad fuse or fusible link somewhere? I have a full blown repair manual but it doesn't mention the aux fan at all. None of the fuse panels mention it separately.

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  • ivybag Jun 19, 2009

    The electric cooling fan that should stay on after you shut the car off to cool down the radiator.

  • ivybag Jun 19, 2009

    Just take two wires and go directly to the battery?

  • ivybag Jun 19, 2009

    Ok, I hooked it up to the battery directly and it works. It won't come on automatically though. Is there a fuse for it? I have checked all the fuses I can find, and they are all good. This is causing the car to overheat after we park it. No overheating while driving, just after we turn it off and it is sitting still. I understand that the fan should be running after the ignition is turned off and it isn't. Ideas?




  • Mike Butler
    Mike Butler May 11, 2010

    Wire 12 volts direct to wires on fan BUT, what do you mean auxiliary, as in maybe AC fan? Does it come on when AC mode selected, or am I misunderstanding the post?

  • yadayada
    yadayada May 11, 2010

    test the fan by jumping power to its connector.

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  • Toyota Master
  • 6,674 Answers

Yah, that will work, or even a 12 or 14 volt cordless drill battery will work.

Posted on Jun 19, 2009

  • 1 more comment 
  • Mike Butler
    Mike Butler Jun 19, 2009

    Don't worry too much about which one is positive & which one is negative, if it's backwards, fan will turn backwards, then just reverse the wires to go right way.

  • Mike Butler
    Mike Butler Jun 19, 2009

    My guess is that there is a relay somewhere in the system, now all we have to do is locate it. I'll do some digging, in meantime maybe you can see what you have for relays under hood etc

  • Mike Butler
    Mike Butler Jun 19, 2009

    Can you get back to me with exact make, model year, & engine?

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1 Answer

Auxiliary power outlet doesn't work. Checked the fuses everything seems fine


Although you did not specify how you checked the fuses, I surmise you used either a light tester at the fuse panel or an ohm meter, since visual inspections can be deceiving.

I will safely guess that this auxiliary power outlet works whether the ignition key is turned on or off and that you checked for voltage while the ignition key was turned in any position, just the same...

In as much as there is a fuse box in the cabin compartment of the car, there is a power distribution panel inside the engine compartment that contains fuses too...and they were checked(?)

I would check for continuity between the pin (base of the socket) and the ground (walls of the socket.) If there is no continuity, most likely the fusible link built-in to the socket- melted as a result of high current draw.

A fusible link is placed within the circuit of the socket itself, for wiring protection, so that you don't damage any other component that's wired on the same circuit (and/or cause a fire in the wiring harness due to the high current draw.)...and you don't necessarily have to blow a fuse at the box or at the distribution panel to have a power loss at the auxiliary power outlet's socket.

Other possibilities to consider, the wires to the socket could have oxidized, frayed; loosened; broke or become disconnected; or the socket itself could be damaged and gone bad (i.e- the fusible link.)

You can also have a break in the wires somewhere else down the line and not at the outlet's socket itself.

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Whats happening if the radiator fan doesn't come on when the engine runs.


The fan may be bad, or the fuse may be blown, or the fusible link may be blown, or the relay is bad.

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Otherwise, you can individually pull out each fuse and look at each one physically to see if there is a blown one.

Sometimes, there are 'fusible links' which come off of the starter which are multi colored and will 'stretch' when pulled on with about 5 lbs. of pulling force. When you find a 'stretchy' wire near the starter, it means the fusible link blew on it (like a fuse would blow).

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You seem to have covered all of the bases except the fusible link that comes off of the starter in an array of fusible links that are different colors and have a rubber piece attached to differentiate it from regular wires.

You can stretch the fusible links to determine if the wire inside has broken.

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Could be a 'fusible link' near the starter. The fusible link will blow when overloaded like a fuse, but looks like a wire with a barrel of rubber around it. You can stretch the wire insulation on it when the fusible link is blown.

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Apparently, your fan motor works when power is applied directly.

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