No Power to AC Compressor on 85 442

Discussion in 'General Discussion' started by 85Cutty442, Feb 11, 2018.

  1. 85Cutty442

    85Cutty442 Not-quite-so-new-guy

    Joined:
    May 1, 2016
    Messages:
    19
    Likes Received:
    1
    Trophy Points:
    3
    Hey all
    I’ve been looking for my problem in the search menu, I’m not seeing my problem, if this has been answered and I missed it, I apologize.

    Here’s my issue.

    Compressor won’t engage,
    I noticed it wasn’t working, so I traced wires and found the wires coming from the compressor had been melted, I blame myself because they ran along the intake, so no big deal, I cut away the damaged wires, replaced with new, I have continuity between compressor and plug. Fuse was blown, so I replaced it.

    Figured I’m all good now as it worked fine before.

    Still nothing, so I thought maybe the relay in the engine bay by the heater, replaced it with new one,
    Still nothing

    So I guess well I’ll jump the pressure switch to see how much Freon is in the system, jumping switch doesn’t force compressor to engage,

    So I vacuum down System, and proceed to refill it, gets to half a can won’t take anymore,

    Checked to see if I have power at the compressor plug, I do not, only ground

    So I’m thinking is there something behind the glove compartment. I see relays, but have no idea if they are for the AC.

    The AC fuse in the fuse box is good, blower fan works,

    I’m completely lost, I don’t know if I’m missing something obvious from being tired.

    So I ask for any and all help to getting this right again

    Car is a 85 Cutlass 442

    Thank you guys
     
  2. Ribbedroof

    Ribbedroof Royal Smart Person

    Joined:
    Jan 4, 2009
    Messages:
    1,991
    Likes Received:
    584
    Trophy Points:
    113
    Location:
    107 miles from Nowhere, OK
    With key on and HVAC set to any of the following..Defrost,Max,Norm,Bi-level check for power at the light green wire where it connects to the cycling switch. If no power there, check for open in light green wire between HVAC connector and cycle switch connector. If all the above checks out, check the mode selector switch terminal where the light green wire attaches to it on the HVAC head

    If you have power there, check for open in dark green wire from cycle switch to compressor

    Also check that the ground on the compressor harness is good

    You could reverse the order for ease of diagnosis/accessability, since the HVAC head can be a PITA on some cars
     
    #2 Ribbedroof, Feb 11, 2018
    Last edited: Feb 12, 2018
    • Informative Informative x 2
    • Like Like x 1
  3. 85Cutty442

    85Cutty442 Not-quite-so-new-guy

    Joined:
    May 1, 2016
    Messages:
    19
    Likes Received:
    1
    Trophy Points:
    3
    OK
    I traced the light green wire from the low pressure switch to behind the glove compartment to a plug.
    I have continuity between switch and the plug.
    I have no power.
    I pulled controller out a lil and looked at wires behind it.
    Look ok.
    I put controller on AC max, key on .
    No power from controller to plug behind glove compartment.
     

    Attached Files:

  4. 85Cutty442

    85Cutty442 Not-quite-so-new-guy

    Joined:
    May 1, 2016
    Messages:
    19
    Likes Received:
    1
    Trophy Points:
    3
     

    Attached Files:

  5. 85Cutty442

    85Cutty442 Not-quite-so-new-guy

    Joined:
    May 1, 2016
    Messages:
    19
    Likes Received:
    1
    Trophy Points:
    3
    This is plug behind glove compartment
     

    Attached Files:

  6. 85Cutty442

    85Cutty442 Not-quite-so-new-guy

    Joined:
    May 1, 2016
    Messages:
    19
    Likes Received:
    1
    Trophy Points:
    3
    Boy I screwed that all up.
    The first pic is the bypass plug I believe it’s called, I have power there, I believe that comes from the fuse box under the dash.

    If the controller is supposed to send power to the low pressure switch through that light green wire.
    Then that would be my issue, since I have no power.
     
  7. olds307 and 403

    olds307 and 403 Comic Book Super Hero

    Joined:
    Oct 14, 2008
    Messages:
    3,073
    Likes Received:
    556
    Trophy Points:
    113
    Location:
    Melville,Saskatchewan
    There should be relay tied into that light green wire. I actually manually bypassed mine with a toggle switch. Same thing, burnt and hacked wires. I find the electrical garbage in these cars.
     
  8. 85Cutty442

    85Cutty442 Not-quite-so-new-guy

    Joined:
    May 1, 2016
    Messages:
    19
    Likes Received:
    1
    Trophy Points:
    3
    The light green wire is see is coming directly out of the controller into a plug behind glov3 compartment, then travels up straight to low pressure switch plug.

    Is that supposed to have power when selecting AC from the controller?

    If yes, I need a controller, if no then which wire sends power out please?
     
  9. Texas82GP

    Texas82GP Comic Book Super Hero
    Silver

    Joined:
    Apr 3, 2015
    Messages:
    4,208
    Likes Received:
    3,237
    Trophy Points:
    113
    Location:
    Spring, Texas
    This might help...
    FourSeasonAirConditioner.jpg
     
    • Like Like x 1
  10. 85Cutty442

    85Cutty442 Not-quite-so-new-guy

    Joined:
    May 1, 2016
    Messages:
    19
    Likes Received:
    1
    Trophy Points:
    3
    Judging by this
    I need a controller

    My green wire has nothing
    My brown/white wire has power, but not the green
     
Loading...
Similar Threads - Power Compressor 442 Forum Date
2018 Power Tour East coast!!! General Discussion Dec 22, 2017
Year One Powercrate 350?? General Discussion Oct 4, 2017
86 monte ss starts but no power General Discussion Sep 28, 2017
Power brake question General Discussion Aug 16, 2017
1973 Trans Am with an ASC Power Sunroof General Discussion Aug 2, 2017

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice