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05 9900ix fan staying on.

Discussion in 'International Forum' started by Jake1460, Mar 21, 2013.

  1. Mar 21, 2013 #1
    Jake1460

    Jake1460 Bobtail Member

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    Mar 21, 2013
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    Ive got a 05 9900ix with a 500hp isx in it. the fan engages shortly after start up and stays engaged constantly from then on. when i shut the motor off it will free spin for a few seconds then it lock in again to stop it. tried replacing the air valve on the firewall and it didnt change anything. ive got 4 fault codes showing but not check engine light. codes are 136:FO5 SID004_A, 136:F10 SID004_A, 136:FO5 SID009_A, 136:FO4 SID004_A. Anyone know what any of them mean?
     
    Jake1460, Mar 21, 2013
    Jake1460, Mar 21, 2013
    #1
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  3. Mar 21, 2013 #2
    Heavyd

    Heavyd Road Train Member

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    Those are all ABS codes. The fan is ultimately controlled by the ECM. Because the fan clutch is engaging shortly after start up, and free wheels for a few seconds after shut down shows there is nothing wrong with fan clutch, solenoid or wiring to the solenoid. The a/c high pressure switch, and the fan override switch are inputs to the ECM and based on state of these the ECM will turn on the fan. I would guess your a/c high pressure switch is stuck open or has an open circuit. It also depends on whether or not your truck has an a/c APADS system or not to determine where and what type of high pressure switch you have. If you find a red coloured switch/sensor near the compressor you can unplug it and jump the connector with a paper clip to see if your fan stays off, then you have found your problem. If you have an APADS system then troubleshooting gets a little harder.
     
    Heavyd, Mar 21, 2013
    Heavyd, Mar 21, 2013
    #2
    silver dollar Thanks this.
  4. Mar 22, 2013 #3
    Jake1460

    Jake1460 Bobtail Member

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    Mar 21, 2013
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    Thanks Heavyd! did just what you said and it shut the fan off. you just saved me 100 bucks to have it plugged in to a computer!
     
    Jake1460, Mar 22, 2013
    Jake1460, Mar 22, 2013
    #3
  5. Mar 22, 2013 #4
    Heavyd

    Heavyd Road Train Member

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    You're welcome, buddy! Glad to help!
     
    Heavyd, Mar 22, 2013
    Heavyd, Mar 22, 2013
    #4
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