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Thread: Another Climate Control/HVAC issue

  1. #1
    Join Date
    Sep 2004
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    Roanoke, VA
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    Another Climate Control/HVAC issue

    I read through the other recent thread on HVAC problems but didn't see anything that matched the thing that mine did this afternoon.
    I am working in PA this week and I noticed as I was leaving the parking lot this afternoon that the LED display on the climate control was not on. I keep it on the outside temp function and during summer I just leave the A/C on 65 with the fan on low, so I rarely ever change the settings on it. Sometime between the time I started the car and the time I got back to the hotel I noticed the display was on again.
    Is my climate control module getting ready to "***** the bed"???
    04 MM Silver Birch/Light Flint, HS, TO, 6CD, #597 of 3214 (sold 5/2014)
    06 MGM LS Ultimate w/HPP, Black/Dark Charcoal
    04 MGM LS (335k miles and counting)
    69 Marquis convertible, 429
    92 F250HD 4x4
    48 Ford F4

  2. #2
    The service manual shows how to run a self test check on the EATC.

    Press the OFF & FLOOR buttons at the same time and release. Within TWO SECONDS press the AUTOMATIC button and release.

    The display will change to the self test mode which basically is a dash symbol ( - ) that chases itself in a square rotation pattern. Any trouble codes will then appear.

    To exit the self test mode just press the BLUE (cooler) button.

    If you get any codes post them here and I'll look them up in the service manual for you.

    Steve

  3. #3
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    Shelby,
    Thanks a bunch for the info. I ran the diagnostic routine and it did the circular formation for a short while and then went into what I assume was a light check. No codes were displayed. Is this procedure for the climate system only, or does it display any stored codes from the OBDII system?
    04 MM Silver Birch/Light Flint, HS, TO, 6CD, #597 of 3214 (sold 5/2014)
    06 MGM LS Ultimate w/HPP, Black/Dark Charcoal
    04 MGM LS (335k miles and counting)
    69 Marquis convertible, 429
    92 F250HD 4x4
    48 Ford F4

  4. #4
    Join Date
    Sep 2002
    Location
    Florida
    Posts
    4,207
    Climate control only, I had the problem with led's you describe with my CrownVic, it was under warranty and the dealer replaced the complete control unit.
    Smokie
    12.79 @ 107 mph.
    60' 1.851 Street tires & Stock wheels.
    TIMESLIPS
    Performance Mods: Base Trilogy Kit, Exhaust, PHP Airbox.
    Visit my Garage
    Florida "The Supercharged State"


  5. #5
    Quote Originally Posted by 69marquis conv
    .... and then went into what I assume was a light check. No codes were displayed.
    Forgot about that part. Yes I came to the same conclusion that at the end it does a light/display check until you exit the test.

    As smokie posted it's only for the EATC system. It would be cool if it did the OBDII codes also.

    Steve

  6. #6
    Join Date
    Oct 2003
    Location
    Beaufort, SC
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    Howdy Boys.....

    Well my HVAC system went wacky today and in the "Auto" mode was blowing air out the defroster for a few minutes.....the floor for a few and back to the defroster?? I called my dealer who told me of the diagnostic procedure but for some reason it won't work on mine??

    With it running I held the "OFF" and "FLOOR" buttons and it cut off briefly and then back on....touching the "Auto" button put it back to auto....WHAT AM I DOING WRONG??

    Damn newfangled contraptions...I want my Model A back!!

    Any ideas?? BTW....after attempting the diagnostic test it seemed OK??

    Marauderjack
    No Marauder

  7. #7
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    mine also freaked out today, i noticed after coming out of a car wash, by hand of course, that the reading for outside temp. indicated -40 degrees and it was 20 outside, in celsius of course, anyhow, the result was that it blew hot air even in max ac settings. It took about 2 hours to slowly come back to normal. Would disconnecting the battery reset everything if it does it again ?

  8. #8
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    Well....I cannot run the self test....WON'T WORK AT ALL!!

    When it calls for "Max" air it blows out the defroster but comes back to the dash vents when the set temp is reached??

    I guess the controler is bad....I'll check the connections and vacuum lines later??

    Marauderjack
    No Marauder

  9. #9
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    got a 043 code on mine, what is it ?

  10. #10
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    Beats me??

    RoyLPita can get it for ya....

    When I hold the OFF and FLOOR buttons it turns off and back on then seems to function OK??

    I took the controller out and all seems to be hooked up!!

    I guess I'll see if my dealer will order one for me...under warranty....until November!!

    Marauderjack
    No Marauder

  11. #11
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    Boca Raton, Fl
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    I had the same freaky thing with a/c blowing out the floor / defroster. The diagnostic check on the unit gave me no errors. I just installed a used a/c control unit from a member and it solved all the problems.
    Black 300A - Sold 4/23/07
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  12. #12
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    code was for the ambient air sensor

  13. #13
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    Installed my new control module today and BOY does it work now!!

    It must have been bad for awhile!!

    Retail was $575.00....Thankfully it was warranteed!!

    Marauderjack
    No Marauder

  14. #14
    Join Date
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    These things seem to be problematical. I have noticed they get hot to the touch when on for a while. My crackpot theory is that the heat eventually kills the electronics.
    White Lightning Kiarauder:
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  15. #15
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    Quote Originally Posted by ckadiddle View Post
    These things seem to be problematical. I have noticed they get hot to the touch when on for a while. My crackpot theory is that the heat eventually kills the electronics.



    that theory is not crackpot...........
    04 DTR
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