What triggers the engine fan on

Discussion in 'Western Star Forum' started by big justin 1974, Feb 17, 2012.

  1. big justin 1974

    big justin 1974 Bobtail Member

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    Dec 19, 2011
    cremona ab
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    What triggers the engine fan to come on when it gets hot?? Is it just the water temp sensor or is it the computer? 05 Detroit 60 series
     
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  3. underpsi

    underpsi Road Train Member

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    Sep 18, 2008
    Toronto, Ont
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    The ecm tells it when to come on
     
  4. big justin 1974

    big justin 1974 Bobtail Member

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    Dec 19, 2011
    cremona ab
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    Can u change the Temp setting in the ECM to come on at a cooler temp?
     
  5. underpsi

    underpsi Road Train Member

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    Toronto, Ont
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    Not easily, I've heard of guys that can do custom programming that can change the temperature setting.
     
  6. truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
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    Not sure about Detroit but cummins you can change the fan temp sensor pre egr came on around 200 post egr comes on around 205 not a big difrence but I guess 5 degree makes a big diffrence especially out her in the so cal desert in the summer at 110 made noticable diffrence on our egr motors
     
  7. underpsi

    underpsi Road Train Member

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    Sep 18, 2008
    Toronto, Ont
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    you could also put a temp switch in and then have to wire it to a new solenoid and tee the air line into the existing line so that at whatever temperature you buy the switch for the fan would come on and you still have the stock solenoid if you ever wanted to still use your fan override switch or if your temp switch ever messed up the ecm would still turn the fan on.
     
  8. fortycalglock

    fortycalglock Road Train Member

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    Jun 25, 2011
    Tourist Town, FL
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    Why would you wan the fan to come on more? That just robs you of fuel mileage. If you have a Star I imagine you have a fan switch on the dash, right? Pop that on if your climbing something crazy or if it makes you feel better. If your overheating, you need to figure out the reason, not put a bandaid on it.
     
  9. thedrifter

    thedrifter Medium Load Member

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    May 23, 2010
    portland or.
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    the fan pulls enough power from the engine I flip mine on when I have a heavy load to go down hill. It will noticable help the jakes. the KW i had the fan was hooked in with the jakes so it came on 10seconds after I activated the jakes. I was told that a fan will pull 12hp from the motor. So i don't wwant it on more than it needs to be. If you are over heating on a pull then you need to drop a gear or more. I was taught to get to a gear that lets the engine run without load meaning if you can;t accelerate while pulling a hill you are in to high a gear.
     
  10. Starline

    Starline Medium Load Member

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    Jun 1, 2011
    Middle Tn
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    You have 3 sensors... Intake, AC and water. Each will cause the fan to come on.
     
  11. timpte

    timpte Bobtail Member

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    Sep 13, 2011
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    Where are they located and is there a testing process for them? My engine fan basically will run almost constantly with only a very brief shut off. Like 3 seconds
     
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