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2012 t800 blower fan not working

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by JohnIC, Jun 1, 2024.

Page 2 of 2
  1. Jun 2, 2024 #11
    JohnIC

    JohnIC Bobtail Member

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    Dec 24, 2023
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    Yes, truck starts
     
    JohnIC, Jun 2, 2024
    JohnIC, Jun 2, 2024
    #11
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  3. Jun 2, 2024 #12
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    Not much I know to say after this. I have seen some odd ones with a breaker or relay in the left frame rail behind the transmission.
    Do voltage drop tests.
     
    BoxCarKidd, Jun 2, 2024
    BoxCarKidd, Jun 2, 2024
    #12
  4. Jun 2, 2024 #13
    JohnIC

    JohnIC Bobtail Member

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    Dec 24, 2023
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    Checked the relays and not sure on results.
    I hear click when energizing pins 85 and 86 and get continuity on pins 30 and 87 but ohms are almost 0 (01.2 ohms). That's all relays measure the same (horn, wiper ON and wiper HI/LO)
    Blower motor (hvac) has no relays. Just ON fuse.
     
    JohnIC, Jun 2, 2024
    JohnIC, Jun 2, 2024
    #13
  5. Jun 3, 2024 #14
    5UG

    5UG Light Load Member

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    May 22, 2024
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    Found this elsewhere on the forum:
     

    Attached Files:

    5UG, Jun 3, 2024
    5UG, Jun 3, 2024
    #14
  7. Jun 4, 2024 #15
    5UG

    5UG Light Load Member

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    May 22, 2024
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    Any progress?
     
    5UG, Jun 4, 2024
    5UG, Jun 4, 2024
    #15
  8. Jun 6, 2024 #16
    JohnIC

    JohnIC Bobtail Member

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    Dec 24, 2023
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    You bet!! It ended up being ACC relay.
    Thanks for the electrical diagram, which is what led me to start checking other fuses. All functions are now operating as they should.
    Thank you
     
    JohnIC, Jun 6, 2024
    JohnIC, Jun 6, 2024
    #16
    5UG Thanks this.
  9. Jun 6, 2024 #17
    5UG

    5UG Light Load Member

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    46
    May 22, 2024
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    Excellent! You're welcome! Good to know! Thanks for the update.

    Take care!
     
    5UG, Jun 6, 2024
    5UG, Jun 6, 2024
    #17
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