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Thread: 2010 town car heater issue

  1. #1
    PROUD DADDY OF JILLIAN PICKUP6772's Avatar
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    Default 2010 town car heater issue

    Hey gang. Been gone for a bit. Scrapped the 89 GM, and been driving the Town Car. I found out last night, that I have an issue with the heating system. I was running the defroster, during a rainstorm, and the right side is running ice cold, even with the temp set at 90. I scanned for codes, and got nothing, code wise. I'm guessing that the r/s blend door is disconnected, and/or broken. Where is this located? I'm thinking behind the glovebox somewhere, but I don't want to just rip it apart, as this is my daily driver. Also, while I'm thinking about it, when I come off the expressway/hwy, I get a warning chime, but NO lights. It does this up to about 20 seconds, or so. With 420, 000 on the car, I suspect maybe oil pressure. The oil is fresh, and clean, with a Motorcraft oil filter, and 5w20 synthetic. Any thoughts/ideas would be appreciated.
    Mike

  2. #2
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
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    Default

    Sounds to me like you're on the right track with the blend door theory. It may be the blend door broke off at its hinge. The actuator will still turn and report back the control head, via position sensor, that it is doing its job while the broken off door is not actually moving. On the older cars its the same as doing a heater core since the blend door actuator is tucked on top of the heater box under the bottom edge of the windshield. Not to mention to get at the blend door you'll need to remove the heater box anyway. Although you might be able to tell if the actuator is moving without going through all that work.
    When you checked codes was it through the EATC self test? (I assume EATC is standard on a LTC.) I'm not sure if a scan tool would pick up those codes, but it might on a 2010 without need for the self test.

    No idea what the warming chime is about.
    Last edited by VicCrownVic; 08-29-2019 at 05:41 PM.
    Vic

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning summer 2020, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - My rotting winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  3. #3
    PROUD DADDY OF JILLIAN PICKUP6772's Avatar
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    VicCrownVic, I went to replace the blend door motor, only to find it was missing. Turns out the Limo company took a few parts out of her, I still have to install an air door motor, as they took that, too. Thanks to my wife, who figured it out, the chime I'm hearing is for when the turn signal is on too long. Now I just have to figure out how to disable it.
    Mike

  4. #4
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
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    Lol, that would do it.

    If I ever buy something made in this century I'll have to keep that in mind about the turn signal warning chime.
    Vic

    ~ 1998 Mercury Grand Marquis LS - new DD
    ~ 1991 Mercury Grand Marquis LS "The Scab" - plenty of rot, summer DD
    ~ 1997 GMC Yukon - wannabe winter DD - returning summer 2020, I finally have an engine
    ~ 1991 Mercury Grand Marquis GS "The Ice Car" - My rotting winter DD
    ~ 1989 Mercury Grand Marquis GS - Rotting Retired DD
    Gone but not forgotten:
    ~ 1988 Country Squire ~ 1987 Ford Crown Vic

  5. #5
    fomoco panthers !
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    Don't you love it when people take (or break) stuff, don't tell you and let you figure it out.

  6. #6
    Stow It! GM_Guy's Avatar
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    I don't trust my memory, but I think the turn signal reminder on/off procedure is in the owners manual. I don't remember seeing it on a list of forscan items. (not that there is much of a list for panthers)

  7. #7
    Southern
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    ForScan to disable the turn signal reminder is actually having to rekey the coding on one of the modules. I believe the LCM.
    -Nick M.
    Columbia, SC

    66 Squire, 89 Colony Park, 90 TC, 03 (2x) TC, 06 TC, 07 TC
    03 BMW 540iT, 04 Ford F150 4.6 XLT Reg cab, 8ft bed

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