Electric Fans Not Turning On

Discussion in '1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-' started by rbreith, Jul 21, 2014.

  1. rbreith

    rbreith Member

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    I installed electric fans into my 89 mustang with the probe thermo sensor in the bottom of the radiator near the outlet to the engine. I ran the car and it just got really hot without the fans ever turning on. I have the switch set to turn on at 180 degrees right now to check it and its not working. I however know that the wiring is correct due to the fact that I also wired it for manual on with a switch and it works fine. do I need to move the thermo sensor and if so where. Also how good do the probe in radiator sensors work vs a thread in
     
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  2. Shakerhood

    Shakerhood Well-Known Member

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    I prefer the threaded sensor, you should move your push in probe up over near the upper hose.
     
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  3. mikestang63

    mikestang63 Mustang Master

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    The probe should be installed about an inch below the upper radiator hose. To test the fan, you can either turn on the A/C if you installed the A/C bypass wire or bridge the temp sensor connections with a wire. What controller are you using?
     
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  4. rbreith

    rbreith Member

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    Derale Performance Single Stage Fan Controllers 16738 off of summit racing
     
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  5. rbreith

    rbreith Member

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    planning to change the fan on to 205 and off at 190. with a 195 degree thermostat
     
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  6. rbreith

    rbreith Member

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    well may be going with 185 on 170 off with a 180 degree thermostat what do you all think
     
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  7. jrichker

    jrichker StangNet's favorite TOOL
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    That may work for a switch type sensor, it depends on if it trips open or closed when it reaches the set point.
    It won't work for a thermistor like the ECT or water temp gauge sender..
    Some time spent with the sensor connected only to a heat source and ohmmeter will be needed to determine what type of sensor is being used.
     
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  8. rbreith

    rbreith Member

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    im gonna say im using a switch type sensor since it has a power wire going to it from a ignition 12v then to the relay
     
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  9. jrichker

    jrichker StangNet's favorite TOOL
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    Sounds right to me...
     
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  10. stangr5oh

    stangr5oh Active Member

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    I agree putting the switch just below the top hose to receive a more accurate temp reading vs a reading from the bottom of radiator as the water temp is lesser I would presume since the radiator is designed to cool water.
     
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  11. Micheal Nadeau

    Micheal Nadeau Active Member

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    Did this happen right after the e-fan install? Is it possible there is a wiring issue?
     
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  12. FoxMustangLvr

    FoxMustangLvr Mustang Master

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    x4 on moving the probe. People have had good success with push in probe type sensors when installed correctly while there's no doubt the thread in is better. Set the fan to come on at a cooler temp until you get it all dialed in.
     
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