ac help

Discussion in 'Freightliner Forum' started by jgrace3357, Jun 17, 2014.

  1. jgrace3357

    jgrace3357 Bobtail Member

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    Jun 17, 2014
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    I have a 2004 century class Freightliner I relaxed the. Compressor and it runs constantly the clutch doesn't dis engage
     
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  3. baha

    baha Road Train Member

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    Is it iceing up an starting to blow warm after some time? may need a bit of freon added, OR temp controler behind Left RT. dash panel 2 wire plug in part.
     
  4. passingthru69

    passingthru69 Road Train Member

    Expanison valve could be froze up also..
     
  5. mitchtazz

    mitchtazz Road Train Member

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    unplug the cable that goes to the compressor and listen for the click.. when power is applied the magnetic coil engages the compressor clutch on the pulley.. if it's engaged constantly then chances are the clutch is jacked. so if you unplug it and remove power and you don't hear the noticeable click letting you know it disengaged, then you need a new clutch..
     
  6. jgrace3357

    jgrace3357 Bobtail Member

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    Jun 17, 2014
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    Thanks for the help I'll check the temp controller the compressor is brand new but I did notice a click when I plugged in the compressor
    There was no power on when I hooked up the compressor
     
  7. mitchtazz

    mitchtazz Road Train Member

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    is the clutch brand new? they're two separate components. you can buy a clutch and use the same compressor, or buy a compressor and use the same clutch.. if you heard a click when plugging it in with the power off, then you most likely have a short with that cable which is allowing the compressor clutch to get power and engage so no matter what the system tells it (engage disengage) it's always going to engage.. time to whip out the multimeter and start tracing wires.
     
  8. jgrace3357

    jgrace3357 Bobtail Member

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    Jun 17, 2014
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    Both the clutch and compressor are brand new so I guess this means my weekend is going to be fun
    Thanks for all the input
     
  9. mitchtazz

    mitchtazz Road Train Member

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    no biggie, hope you find it. also, i think there's a fuse for it also.
     
  10. textroublemaker

    textroublemaker Bobtail Member

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    May 31, 2010
    ft worth tx
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    you might try using a jumper wire on the high pressure switch(mines under the windshield wiper tray on the passenger side) and see if compressor engages seems to have been a problem on my trucks good luck
     
  11. country29

    country29 Medium Load Member

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    Feb 27, 2010
    Arkansas
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    if the ac compressor clutch is staying engaged/locked in, make sure the key is off and see if you can spin the outer part of the clutch, you should be able to, if you cannot spin the front hub of the clutch with the key off, pull the panel off above the fuse block on top of the dash, there is a relay in there labeled hvac, pull that relay out and see if you can turn the ac clutch by hand, if you can with the relay out but cant with the relay in, that hvac relay is bad. they are notorious for going bad on the century/Columbia's, and when they stick open they send power to the clutch at all times. it is a 5 prong relay, about $5 at freightliner.
     
    mitchtazz Thanks this.
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