2004 Deville, driver side heating doesn't seem to work but passenger side is fine.
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2004 Deville, driver side heating doesn't seem to work but passenger side is fine. in Past Cadillac Vehicle Discussion; I am new to this Deville, and never had dual heating controls before. But the driver side seems luke warm ...
  1. #1
    Farm-Trucker's Avatar
    Farm-Trucker is offline Cadillac Owners Member
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    2004 Deville, driver side heating doesn't seem to work but passenger side is fine.

    I am new to this Deville, and never had dual heating controls before. But the driver side seems luke warm at best, while the passenger side seems fine. I'm new to this site, but can anybody help me?

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    MoistCabbage's Avatar
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    I assume you mean when you're NOT using the dual zone feature?

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    basscatt's Avatar
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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    you may have a failed/broken mix door actuator -
    ----------------------------

    check for Diagnostic Trouble Codes -

    if you don't know how - go here and read the ENTIRE post -

    http://www.cadillacforums.com/forums...odes-dtcs.html

    if you have any codes - post them here -
    ALONG WITH THEIR DEFINITIONS -
    ----------------------

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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    Thanks alot for the fast reply, I'll check the codes in the morn.

    ----------

    It doesn't matter if I'm using the dual zone feature or not, the temp for the driver's side is still luke warm at best. But if you do turn on the passenger side, it has full power heat.

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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    Try exercising the air door and the actuator by running the temp up to 90 and back down to 60 a few times (unless you have an actuator code).

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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    I believe I do have a code, it is {IPM B0429}. I was trying to read about it, but it looks like that code pertains to the rear heat.

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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    Correct.
    B0429 Temperature Control #3 Rear Circuit Range/Performance

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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    Taking the temp up to 90 seemed to have worked somewhat, for the drivers side heat. At least I know it will work. I'd like to thank everybody for thier quick responses, it felt like a warm welcome to the site.

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    morty9614 is offline Cadillac Owners Member
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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    my 99 Deville did this too. Was told to unhook battery cable, wait a few seconds ( 30 ) then re-attach cable. It worked ! I maybe got lucky is all. Today,I have discovered a sticky actuator behind the glove box. Maybe for a quick fix, the battery cable did something. You all say look for a code to see if its an actuator so there must be a PCM signal there. I am old-school...I use my eyes and ears to fix stuff in my "Northstar ". That motor is a trip !! But...when she is in a good mood...and she is happy ( all fluids good etc ).....Lady Northstar is BADASS ! Somebody on here complained about $200 for an actuator. Bought mine on E-bay new for $65 used ones are $30 and up. Easy fix too. Pop off 3 screws under glove box...two in the actuator...and disconnect arm. Reverse process to install...popcorn ! There is even a YouT
    ube vid to help ya too !
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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    IF the problem is a sticky door (as opposed to an actuator with stripped gear teeth) you can usually free it by exercising it. Do that by running the temp from 90 - 60 and back a few times.
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  12. #11
    morty9614 is offline Cadillac Owners Member
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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    I am backwards again ! On my 99 Deville, passenger side is not heating, drivers is fine. I did the exercise thing too. Ok...several questions. First...how do I reset PCM without a dealer doing it for $ 100 ? Fixya.com says this and E-how.com says that. I like E-how saying just pull the PCM fuse, tirn ignition to on but not start and wait 5 minutes, put fuse in and go. Only problem is...I have about 5 different fuses relating to PCM on my fuse box above left tire...one maybe in behind the back seat and another fuse panel adjacent to the one above the tire. My hunch is " PCM BATT" fuse. Why ? back in the summer I had new compressor put in. My passenger told me hot was blowing on him while I was getting cold. I " think " I fixed it by unhooking battery cable for 30 seconds. It worked but how ? Question...does THAT alone reset PCM ? I know how to do the OFF and red temp button thingy using fan switch to answer questions. Does THAT reset PCM too ? I want to eliminate this possibility before I get all stressed about blend doors, actuators and all that. I have replaced lower actuator but now I hear its the TOP actuator that moves the door so my passengers do not gripe about cold feet like one did yesterday ! Question again...when I installed lower actuator and if I gotta do the top one...should I put temp button at 60 degrees before I hook the little silver rods on ? Radiator...thermostat...core all good.
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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    There is no "resetting" of the PCM. If you have a bad actuator you should have a Body (B) code set.

    #18 is the passengers side actuator.
    http://www.gmpartsgiant.com/Page_Pro...053&SortKey=12
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  14. #13
    morty9614 is offline Cadillac Owners Member
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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    Parts diagram helpful; explaining what I saw yesterday. Blend door must be sticky because actuator moves but " stutters " a bit. Sometimes, I put temp button to 60 forcing air out the dash vents, then, as I slowly work up to 90...around 75 I get heat ( sometimes ). Not all the time. Thanks Ranger for the diagram. Now I do not have to be concerned about the actuator directly behind the glove box. I am glad to hear all these " hillbilly PCM cures " are not accurate. The actuator moves, so undoubtedly a door issue.Thanks 4 the drawing too ! ( I should have not put a 99 year Cadillac problem under THIS thread. ) Ranger...your diagram IS for a 2004,but I went to the site and found a 99 AC/Heater diagram. )

  15. #14
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    Re: 2004 Deville, driver side heating doesn't seem to work but passenger side is fine

    oops. I was looking at the title and not your ownership ('99), Sorry. That's why it always better to start a new thread rather than hijack an old one. My '97 was a little sticky at times. I found that running the temp from MIN to MAX and back a few times help. Eventually you may have to lube the door (valve).

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