60 Series Detroit AC doesn’t work

Discussion in 'Freightliner Forum' started by DMSD, May 16, 2020.

  1. DMSD

    DMSD Bobtail Member

    3
    3
    May 16, 2020
    0
    I have a 2012 Freightliner Coronado with a 12.7 Detroit(Fitzgerald Glider Kit)....my AC does not work at all. When I had my truck in at a Freightliner dealership for unrelated issues, I asked the tech to test the Freon. He then told me that it was charged and no leaks, the issue is electrical but it will cost more to figure out why it will not run. Any thoughts to help me to figure out why this is happening will be much appreciated
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. rachi

    rachi Road Train Member

    3,732
    3,701
    Feb 25, 2010
    SoCal
    0
    Could be a short in the wiring, or a bad compressor. Check your AC fuse in the glovebox too!
     
  4. singlescrewshaker

    singlescrewshaker Road Train Member

    1,704
    12,936
    Dec 31, 2017
    Palmgetto, FL
    0
    download.jpeg.jpg
    So this is like a $7-$12 part. Went bad on my FLD few months ago. It's a low air switch that keeps the ac compressor from turning on till it sees X amount of air psi. Needs to see air psi so it knows it can activate the engine fan to blow air across the condenser..

    Worth a shot to swap it out for just a few bucks..

    Edit: When you say ac don't work at all, do you mean blower motor, like no fan or nothing..?
     
  5. stillwurkin

    stillwurkin Road Train Member

    1,561
    2,434
    Dec 2, 2017
    0
    I am not a ac tech. But if its charged and ready. With my truck engine off, and the ac switch on, and the blower fan on for the cab. I cycle the ignition switch and i can hear the ac compressor clutch click on and off.
     
  6. DMSD

    DMSD Bobtail Member

    3
    3
    May 16, 2020
    0
    When I say AC doesn’t work I mean blower motor works, and the indicator light laminated, but it does not get cold....Where would that be located at on the truck?...directly mounted to the compressor?
     
    Last edited: May 16, 2020
  7. DMSD

    DMSD Bobtail Member

    3
    3
    May 16, 2020
    0
    On the Coronado they are not behind a panel behind the Go pedal like on the cascadias
     
    Rideandrepair Thanks this.
  8. singlescrewshaker

    singlescrewshaker Road Train Member

    1,704
    12,936
    Dec 31, 2017
    Palmgetto, FL
    0
    I don't have a Coronado, but a '93 FLD120. It is a series 60 powered tractor though..

    1st, check the ground wire, & all connectors right at the ac compressor to make sure nothing is loose, & all is connected properly.

    So my low air switch is located behind the dash. Took out the dash cover right in front of the gearshift stick in the center of the cab. There is an air manifold right there with a few air lines going into it, & the pressure switch that looks like the one I posted above..

    There will probably be a few, for low air alarm, parking brake, etc. Might need a wiring diagram to find the correct one.? Or pull off the 2 wires & see what stops working..

    Also the high/low switch on the air drier would be the next thing, I'd check.. Air drier is on the firewall, ditch side, or have seen some on the frame rail by the steer tire. Drier looks like this. Switch on top. Make sure is connected, & not corroded. Maybe replace that too.?

    unnamed.jpg
     
  9. singlescrewshaker

    singlescrewshaker Road Train Member

    1,704
    12,936
    Dec 31, 2017
    Palmgetto, FL
    0
    Wait, so the ac light, or snowflake symbol is illuminated?
    But the compressor still doesn't spin.? Like the ac clutch won't engage..
     
    stillwurkin Thanks this.
  10. stillwurkin

    stillwurkin Road Train Member

    1,561
    2,434
    Dec 2, 2017
    0
    Thats why i kinda wanted to establish that the compressor clutch was even clicking on.
     
  11. singlescrewshaker

    singlescrewshaker Road Train Member

    1,704
    12,936
    Dec 31, 2017
    Palmgetto, FL
    0
    10-4 Sir! I got it now. Key on, sends power, listen for the magnet click.
    Yep, I might had been getting a head of myself. I'm no ac expert diagnoser. LoL Just had a few quick fixes myself & thought they might work for this fella.

    If the ac light is on/illuminated, yet compressor clutch not engaging I'm lost.. :dontknow:
     
    stillwurkin Thanks this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  • Draft saved Draft deleted