Problem with climate system

Lincoln LS

  1. lincoln_zero

    lincoln_zero Dedicated LVC Member

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    So this morning took the LS to get tinted, and after leaving, I now have an issue.

    AC blew cold through all vents yesterday in the 2.5 hour drive home, and all last night when I went out to dinner.

    Now today here's what its doing:
    Set to cold (16 degrees both sides) AC on, Circ on:
    Left Driver side vent vent: Cool air (not freezing cold)
    Middle two vents: Cool on top part, hot on bottom of same said vent.
    Right Vent Passenger side: Very warm air.

    When I raise the temps to Max heat (32): all vents blow pure hot.

    2004 Lincoln LS V8.
    Any help is appreciated as always fellas. Probably a common issue. But it would help to know where to start.
     
  2. joegr

    joegr Dedicated LVC Member

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    Well, unfortunately that didn't take long. While it could be something else, it sounds like low refrigerant. A check with high-side/low-side gauges will quickly confirm this or rule it out.
    Is it possible the seller topped it up just before you looked at it?
    Also unfortunately being in Canada complicates the problem for you. Stay away from the R-12a stuff. (I hope that's not what's in there now.)

    I remember sometime in the 80s going to look at a car that was parked in an empty lot near a gas station. The seller remarked that he sure hoped it started okay since it had not been started in a month. (I had already felt the warm engine.)
    Afterwards, talked to the attendant in the gas station. He said that he watched the seller go to the car 30 minutes before I got there and put a can or two of Freon in.
    That said, most sellers aren't that bad.
     
  3. lincoln_zero

    lincoln_zero Dedicated LVC Member

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    Hey thanks for the quick reply.

    I called the seller, he says he didn't touch the AC at all. We had a cold spell here, and when I got in the car for the first time, it was set to a warmer temp. I do think its literally just awkward timing. Tho my dad had the exact same experience you had, but with a T-Bird. Salesman warmed it up and the next day, nothing but problems on startup.
    So I wouldn't rule out they may have charged it. But they deny doing so.

    So i'm gonna try and have a crack at it with a friend of mine who did some mechanical work. "high-side/low-side gauges" <-- where are those? I'm not sure what I'm looking for. Thanks joegr.
     
  4. joegr

    joegr Dedicated LVC Member

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    If you have to ask, you shouldn't be the one doing it...
    Take it to a good AC shop or a good dealer.
     
  5. lincoln_zero

    lincoln_zero Dedicated LVC Member

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    I wouldn't be doing it alone. My friend worked as a mechanic for hyundai. Hes a novice mechanic, but knows his way around. I would never attempt anything involving pressurized lines all by my lonesome.
     
  6. lincoln_zero

    lincoln_zero Dedicated LVC Member

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    What do you recommend for freon?
     
  7. joegr

    joegr Dedicated LVC Member

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    It's "Suva", not "Freon". You need R-134a only (and some pag oil, of course), but you are getting ahead of yourself here.
    Check the pressures. See how they fit with the factory charts to see if you are low or not. Note that Hyundai's procedures and expected pressures are different, even though they use R-134a too.
    If the refrigerant level is low, you need to find and fix the leak, replace the receiver/dryer, vacuum the system out, figure out how much oil is still in there and add to get the correct amount, and then weight the correct amount of R-134a in.
     
  8. lincoln_zero

    lincoln_zero Dedicated LVC Member

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    Thank you. I will definitely show this procedure to my friend and go from there.
     
  9. lincoln_zero

    lincoln_zero Dedicated LVC Member

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    So i haven't worked on the AC, literally after posting the weather here north of Toronto dropped to 9 Celsius.

    However, I don't think I have an AC leak issue. The other day it was down to 4 degrees, I dialed down the temps to 16 Cel, the lowest it will go, and I'm getting blasting HOT air. like as if its set to MAX. I can't control my temp at all, its only pure hot.

    When I turn on the AC, with my hand over the vents, I feel a slight cool air mixing in with the blasting heat. I never had this issue on my other LS's. What do you guys think it is?

    EDIT: Blend door or switch be the issue?
     
  10. joegr

    joegr Dedicated LVC Member

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    For the thousandth time, the LS HAS NO TEMPERATURE BLEND DOOR. Never has.

    The DCCV controls temperature. These do fail. You could start with some self diagnostics.

    The DATC module self-test through the front panel display:

    • can be initiated at any time. Normal operation of the system stops when the self-test is activated.
    • is entered by pressing the OFF and DEFROST buttons simultaneously and then pressing the AUTO button within 2 seconds. Record all DTCs displayed.
    • concludes by reporting all on-demand DTCs. Follow the diagnostics procedure given under ACTION in the DTC index for each DTC given.
    • reports individual on-demand DTCs as 4-digit DTCs (less the alpha character).
    • will calibrate all the mode doors and check all analog inputs. The DATC module will only report on-demand (hard) faults that occurred while the DATC module was conducting its self-test.
    • will light all control panel display segments if no faults are detected.
    • will report individual on-demand DTCs without the °C symbol lit.
    To exit the self-test, press the DEFROST button. This will clear all on-demand codes from the DATC module memory. If no button is pushed, DTCs will continue to be displayed.

    Upon exit from the self-test the DATC module returns to operational status. The DATC module executes a hard (cold boot) reset which places the DATC system in the OFF mode.


    You may get one of these codes.

    B2797 2797 Driver Coolant Control Valve Open Circuit Go To Pinpoint Test J .
    B2798 2798 Driver Coolant Control Valve Circuit Short to Ground Go To Pinpoint Test H .
    B2799 2799 Passenger Coolant Control Valve Open Circuit Go To Pinpoint Test J .
    B2800 2800 Passenger Coolant Control Valve Circuit Short to Ground Go To Pinpoint Test H .


    If you don't then it could be a mechanical problem with the DCCV instead of electrical.
    In that case: 2006 Lincoln LS Workshop Manual
     
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    • lincoln_zero

      lincoln_zero Dedicated LVC Member

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      WOW. ... now I know why people spend $800+ at a shop to resolve climate issues.

      Ok I'll start from the beginning with a self test and scan.
       
    • lincoln_zero

      lincoln_zero Dedicated LVC Member

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      [​IMG]
       
    • joegr

      joegr Dedicated LVC Member

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      Doesn't show anything for me...
       

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