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5700 Manual Fan Clutch Switch Installation

Discussion in 'Western Star Forum' started by ShortCircuit, Jul 31, 2019.

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  1. Jul 31, 2019 #1
    ShortCircuit

    ShortCircuit Bobtail Member

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    I want to install a fan clutch switch in my 5700. To my understanding I need to wire it to the fan clutch solenoid to manually engage it. Can anyone please share a wiring diagram?
     
    ShortCircuit, Jul 31, 2019
    ShortCircuit, Jul 31, 2019
    #1
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  3. Jul 31, 2019 #2
    mhyn

    mhyn Road Train Member

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    no one will have wiring diagram of you truck. each truck's wiring diagram is different and you can get it from dealer. they must run your trucks vin. I want to help you. I have never opened the door of 5700 and I don't know it has Sam modules or not. What year is your truck? That truck has SAM Cab module? If it has Sam Cab then I can tell you what to do to switch on or off the fan.
     
    mhyn, Jul 31, 2019
    mhyn, Jul 31, 2019
    #2
  4. Jul 31, 2019 #3
    ShortCircuit

    ShortCircuit Bobtail Member

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    It’s 2017 5700XE, how can I check if I have SAM module? I have a laptop with DDDL and NexIQ interface. My only plausible plan is to wire a switch in the AC high pressure sensor, when circuit is open fan clutch is engaged. However I would like a more elegant and permanent solution without having to modify sensor wire harness.
     
    ShortCircuit, Jul 31, 2019
    ShortCircuit, Jul 31, 2019
    #3
  5. Jul 31, 2019 #4
    mhyn

    mhyn Road Train Member

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    2017 . has different module.
    your plan is a good one. it works on pre 2017 models . Try it.
    Just for info- CPC has not connected cavity and if you put toggle switch between ground and that cavity fan will come on after 5-8 second delay. Open DDDL and go to A&I DDEC manual, in help/troubleshootings. Search in A&I DDEC manual for fan activation. You will see which one is that cavity for your truck. CPC is located under dash . I Don't know exactly where in your truck. Just ask dealer where it is located.
     
    mhyn, Jul 31, 2019
    mhyn, Jul 31, 2019
    #4
    jamespmack and ShortCircuit Thank this.
  7. Aug 6, 2019 #5
    Commander1

    Commander1 Light Load Member

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    CPC is located behind ash tray.
     
    Commander1, Aug 6, 2019
    Commander1, Aug 6, 2019
    #5
    jamespmack and mhyn Thank this.
  8. Oct 18, 2019 #6
    Wombat63

    Wombat63 Light Load Member

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    Did you end up installing the fan switch? I'd be interested to see how you ran it I'd like to do the same. Thanks
     
    Wombat63, Oct 18, 2019
    Wombat63, Oct 18, 2019
    #6
  9. Oct 19, 2019 #7
    Rolling18

    Rolling18 Light Load Member

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    I am interested in this as well for my 2017 4700..???

    I did this in my 18 KW T880 ... got the OEM smart switch. using the Nexiq and laptop paccar software told CECU it was there and activated it.. (multiplexed system)

    I would think it to be similar to W Stars??
     
    Rolling18, Oct 19, 2019
    Rolling18, Oct 19, 2019
    #7
  10. Oct 19, 2019 #8
    Rolling18

    Rolling18 Light Load Member

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    Dec 11, 2008
    Portland, OR
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    Where to get DDDL, A&I, DDEC, CPC???
    is there any other software I should obtain???
    thanks!
     
    Last edited: Oct 19, 2019
    Rolling18, Oct 19, 2019
    Rolling18, Oct 19, 2019
    #8
  11. Oct 25, 2019 #9
    ShortCircuit

    ShortCircuit Bobtail Member

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    May 7, 2017
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    I made a harness to go in between high pressure AC sensor and ECM harness plug. The harness has one wire split and connected to a toggle switch in the cab. Basically if AC high pressure sensor circuit is open the ECM engages fan clutch. Later I’ll buy a genuine fan button for my star but for now this works.

    AD4D701E-7CDA-49D9-B54A-D91CA92EABA9.jpeg 5E1B83AD-CF73-4477-9B24-1CEC4B7A4C0D.jpeg 53F31F1A-A5F0-4B02-9BDB-DEEBCEB8A185.jpeg
     
    ShortCircuit, Oct 25, 2019
    ShortCircuit, Oct 25, 2019
    #9
    mhyn Thanks this.
  12. Oct 25, 2019 #10
    mhyn

    mhyn Road Train Member

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    @ShortCircuit when you switch on/off the fan do you see a fault code popping up ?
     
    mhyn, Oct 25, 2019
    mhyn, Oct 25, 2019
    #10
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