Bunk Blower keeps going to high on its own.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Sleepy3103, Oct 11, 2018.

  1. Sleepy3103

    Sleepy3103 Light Load Member

    Mar 18, 2007
    Swanton, OH
    Hey guys, I have a 2018 freightliner cascadia. For some reason the bunk blower motor will turn it self on high for no reason. Going down the road and my wife is in the back or me, and both front and rear blowers will be set to low or in the middle and the rear blower will just slowly turn up to high. Sometime it does it all the sudden, other time you can hear it start to turn up. WTF is going on? Anyone have any ideas or experience with this?
  2. sirjeff

    sirjeff Light Load Member

    Dec 1, 2013
    Kelowna, BC
    You have a ghost in your truck. I do too, passenger window rolls down randomly, sometimes all day long then not at all for weeks. Wet or dry it doesn't matter.

    I dont know first hand but I believe a bad blower motor resistor will cause erratic fan behavior..... probably the easiest place to start unless theres some codes that lead somewhere else? Hopefully someone else can confirm or set me straight
    Last edited: Oct 12, 2018
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