Question about 2003 Hyundai Tiburon

3 Answers

Fan wont stop running

I noticed when I went out to my car this morning the fan was continually running. I was told it could be one of my 2 relay switches. How do I determine which one it is and how do I change it?

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  • roses60 Oct 15, 2008

    I want to check this & do the repairs myself..I understand there are 2 relays, so I need to know how to verify which one it is and I need instructions on how to replace it.

  • roses60 Oct 15, 2008

    I sure hope I didn't pay for someone to tell me to get the 'fan relay' checked as I already identified that I knew it was a relay issue in my question...please advise where these are located and how do I verify which relay needs to be replaced and what needs to be done to replace it.....

  • roses60 Oct 15, 2008

    I noticed when I went out to my car this morning the fan was continually running. I was told it could be one of my 2 relay switches. How do I determine which one it is and how do I change it? The answer I got from my 1st posting advised me to get the fan relay checked, I am looking to do these repairs myself as I understand it isn't that complicated. I need a diagram showing me where the relays are and how to test and replace the bad one.

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  • Master
  • 749 Answers

If they are both the same relay, then buy one new one and replace them one at a time untill you get the right one. Otherwise you will need a multimeter and wiring diagram of the relay to test it.

Posted on Oct 15, 2008

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  • Master
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Hi,

Offhand, the radiator fan working even when the engine just switched off is a design feature. The fan should run for a few minutes and automatically switch off. This would be specially so on unuasually warm weather.

If and when the auto shutoff does not happen; then as you posted the relay could be faulty. Although it would be rare for a relay to lock in the on position. It would normally be intermittent or not function at all. Nonetheless, the radiator fan relay is located with the other relays and fuses in the fuse box/relay bank under the hood.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Oct 15, 2008

  • Louie  Role
    Louie Role Oct 15, 2008

    Hi again,

    Specific relay layout may vary slightly due to differences in country of origin/manufacture, intended region, versions. Two ways to determine which relay:


    • in the relay bank with the radiator fan still engaged and engine off, pull the relays one at a time till fan stops. I suspect it would be beside the headlight relay;

    • reference the service manual. free Online service manuals maybe found herehttp://www.hmaservice.com/. You need to register, use Internet Explorer, follow directions carefully. If it would lead/pop to the US, your VIN may be required.
    Cheers.


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  • Master
  • 1,847 Answers

Get the fan relay checked that might be causing the issue.

Posted on Oct 15, 2008

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  • Legin Varghese
    Legin Varghese Oct 15, 2008

    There could be issue with the heat sensor that allows the fan to stay on after the key is off to cool down the under hood temperatures. If the fan stays on as you have said, the sensor is most likely faulty or shorted.

    but check the relay first they only cost like 10 bucks

    let me know if you need further assistance.

    Thanks Kevin.


  • Legin Varghese
    Legin Varghese Oct 15, 2008

    You have to get both the relays checked,
    It is situated on the right side of the radiator fan.



  • Legin Varghese
    Legin Varghese Oct 15, 2008

    Now
    for the relay, or relays. Some vehicles will have a high-speed relay
    and a low-speed relay. Turn on the ignition switch, and using your
    wiring diagram, locate the wire for the ground side of the relay coil.
    When you ground this wire, you should hear the relay click and the
    fan(s) should come on. If it does, then you know the wiring up to, and
    including the relay, are good. Now we know the problem is between the
    CTS and the relay.

    If
    the fan doesn't come on, we need to continue with the relay and it's
    wiring. There are two current feeds, one for the relay coil and the
    other for the cooling fan(s). Using your wiring diagram, locate these
    feed wires and probe them with a test light. With the ignition key on,
    there should be power at both wires. If you have power to one and not
    the other, you have an open in the wire from the fuse to the relay.


    If
    the fan doesn't come on, we need to continue with the relay and it's
    wiring. There are two current feeds, one for the relay coil and the
    other for the cooling fan(s). Using your wiring diagram, locate these
    feed wires and probe them with a test light. With the ignition key on,
    there should be power at both wires. If you have power to one and not
    the other, you have an open in the wire from the fuse to the relay.








    You can jump across the fan relay to confirm the relay's failure.



    On
    systems that have computer control using a sensor signal, you can make
    a similar test of the relay current feed terminals with a test light
    and the ignition key on.


    If
    the current feeds are good, ground the relay's switch terminal (the one
    with the wire that goes to the coolant switch). If there's a sensor and
    the switch terminal wire goes to the PCM, unplug the wire before
    grounding the terminal. The relay should click and operate the fans. If
    it doesn't, replace the relay.


    You
    may have trouble doing this with relays that plug into an under hood
    relay "center." Unplug the relay; turn on the ignition and with your
    test light probe the two current feed terminals in the relay center. If
    they pass (turning on the test light), make up short jumper wires to
    connect to the unplugged relay and one long jumper (that you run to an
    electrical ground) for the switch terminal. If the relay still doesn't
    work (ignition on), replace the relay. If the relay does click, probe
    the output terminal to the fan motor with a grounded test light. If the
    light goes on, the problem is in the wiring from relay to fan motor.


    Your
    diagnosis may point to the PCM. It's rare, but a computer failure can
    be responsible without a Check Engine Light or DTC. Perhaps just a
    single driver has blown, so the PCM itself seems to be performing
    normally. In addition, in a number of cars, particularly GM models, the
    PCM turns off the fans if the vehicle is cruising 40 to 45 mph or
    higher. This strategy relies on the vehicle speed sensor, which may be
    misbehaving. If your speedometer is way off, or not working at all,
    it's something to consider if the relay works when grounded.


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