AC switch/wiring keeping fan running

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by skman, May 16, 2024.

  1. skman

    skman Light Load Member

    298
    120
    Aug 26, 2013
    Saskatchewan
    0
    My fan keeps running when I start truck. In InSite data monitor it says AIR is commanding it. When I shut AC switch off in parameters and start truck....the fan is off.
    So I put it back to ON in parameters...unplugged the connector and used a paperclip and waited a few minutes....wouldn't shut off.
    I used my test light and had full light power on one pin...tried the second pin and it had dim light power. When I leave the grounded test light on that (dim pin)...it will shut off the fan. As soon as I pull it away...the fan starts again.
    I assume there's not supposed to be voltage on both pins?
    This started after getting a shop to fix my erratic coolant alarm. That seems good now but I have this problem instead lol
     
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  3. Smellfunny

    Smellfunny Road Train Member

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    Jan 28, 2012
    South Carolina
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    You might want to post Truck make and model and engine for people to help.
     
  4. skman

    skman Light Load Member

    298
    120
    Aug 26, 2013
    Saskatchewan
    0
    Good point!
    It's a 2016 Pete 389 with ISX15 2350
     
    Smellfunny Thanks this.
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