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A / C

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mr Bob, May 22, 2019.

  1. May 22, 2019 #1
    Mr Bob

    Mr Bob Light Load Member

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    Got a 2011 Durastar 4400. A / C compressor has no power going to it. Chased the wire and it seems to go from the BCM across to the right side but there is no continuity across there. Does the wire A77A go to something else in the dash? Also have no power coming out of the BCM on that wire. System is charged and works if I put power to the compressor. Got a code for blend door malfunction too.
     
    Mr Bob, May 22, 2019
    Mr Bob, May 22, 2019
    #1
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  3. May 22, 2019 #2
    Heavyd

    Heavyd Road Train Member

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    AC is computer controlled and will not work with the blend door code active. Fix the blend door problem and retest. Compressor circuit is A77A out of the body controller, then across the dash and out the firewall on the right hand side, then through that connector near the wiper motor where it turns into K77 to the compressor.
     
    Heavyd, May 22, 2019
    Heavyd, May 22, 2019
    #2
    Mr Bob Thanks this.
  4. May 22, 2019 #3
    lwlevens

    lwlevens Medium Load Member

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    Sorry wrong post
     
    lwlevens, May 22, 2019
    lwlevens, May 22, 2019
    #3
  5. May 22, 2019 #4
    Mr Bob

    Mr Bob Light Load Member

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    So I may also have a wire break between the BCM and the right side near the fuse box?
     
    Mr Bob, May 22, 2019
    Mr Bob, May 22, 2019
    #4
  7. May 22, 2019 #5
    Oneel998

    Oneel998 Bobtail Member

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    May 21, 2019
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    JUST APPLY A LOAD TO THE WIRE AND TEST IT OR OHM IT OUT IF YOURE THINKING YOU HAVE A BROKEN WIRE. OHMING WILL ONLY TELL YOU IF YOU HAVE OR DONT HAVE A COMPLETE CONNECTION. YOU CAN HAVE 1 SMALL STRAND BUT NOT ENOUGH TO CARRY THE AMP TO THE COMPRESSOR
     
    Oneel998, May 22, 2019
    Oneel998, May 22, 2019
    #5
  8. May 23, 2019 #6
    Mr Bob

    Mr Bob Light Load Member

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    Im suspecting a relationship between my 2 problems
     
    Mr Bob, May 23, 2019
    Mr Bob, May 23, 2019
    #6
  9. May 23, 2019 #7
    Heavyd

    Heavyd Road Train Member

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    I would just find A77A at the body controller, and run and new wire from there out the firewall through a vacant hole near the steering column out to the compressor.
     
    Heavyd, May 23, 2019
    Heavyd, May 23, 2019
    #7
  10. May 23, 2019 #8
    Mr Bob

    Mr Bob Light Load Member

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    That turned out to be a visual obscurity issue. (Need better glasses) BWAAAHAHA
    One of the door motors has a broken drive socket. Will replace that and see what happens.
    If your ever in town, dinner is on me.
     
    Mr Bob, May 23, 2019
    Mr Bob, May 23, 2019
    #8
    Heavyd Thanks this.
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