Re: heater core replacemant
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Cadillac Tech Tips - How to fix it Discussion, Re: heater core replacemant in Item Specific Cadillac Discussion; Procedure to replace a heater core in a 96DeVille: 1) Remove the negative terminal on the battery. You're going to ...
  1. #1
    krimson_cardnal's Avatar
    krimson_cardnal is offline Cadillac Owners Enthusiast
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    Re: heater core replacemant

    Procedure to replace a heater core in a 96DeVille:

    1) Remove the negative terminal on the battery. You're going to be working around the passanger airbag and pulling electrical connectors of the A/C Programer. Good idea to kill the power.

    2) Open glove box and observe the access door in the rear. You are going to open this. Give a good tug on the left end of the door and pull straight in. Give it a good one, it will pop open. Un-clip the airbag connector that's clipped in place.

    3) Remove the glove box. Six torque screws hold the glove box in place. Four on the front [open the door first] and two on the glove box floor. If you don't have appropriate torque drive a hex drive will work [especially on those two on the box floor]. Don't worry about the electricl wires plgged into the left end of the box. Pull straight out and then rotate the assembly off to the left out of the way - no need to unhook all that stuff and tempt Murphy.

    Nice thing is that you will be working though this opening and not standing on your head under the dash, most of the time!

    4) Under the dash panel is a black plastic sound panel that needs to be removed. Its held in place by three 7mm screw nuts along the near edge. Remove these and the panel will drop down and pull out. If your old core sprung a leak this caught some of the coolant - take care and wash the foam on the rear of the panel. Hot water and soap in the kitchen sink will do.

    5) You are going to want to protect the left front fender while you attempt pulling and installing the heater hoses. Once done, pull the heater hoses on the engine side of the fire wall. This is a pain in that there's hardly enough room and it is a two handed operation. Take care not to damage the hoses - new sets are dear. Also watch out for all those vacume lines and electric lines that are right there crowded in and around. Keep in mind you are going to hook these up to the new core. That will prove more difficult.

    6) Back inside the cabin take a look inside the glove box opening. Tucked away back to the right of things, way up there, you will see a silver box with colored vacume lines attached to its bracket. This is the A/C Programer. Look closely and you will see a single screw nut on the right end of the bracket. This is what you need to remove. Take care and do not drop that screw nut. You will never find it and will need to replace or, as I did, improvise to get it back together.

    With the screw nut removed the whole A/C Programer unit wil be free and you will be able to wiggle it out and down. Move connectors as needed and take care with those vacume lines. Do not try to pull these. Don't want to think about trying to replace that stuff and remember Murphy. With the unit down flip it and pull the electric connectors off the progamers bottom edge. They release with a clip connection on the back side - pinch and pull.

    Object here is to make room to the right side of that black plastic box you're seeing. This is the heater box.

    7) Look on top of the heater box. You will see a control rod. Un-clip this on the right side, where it clips onto a white plastic control piece. All you need is a screwdriver under the rod on the right end and twist to pop it out of its groved retainer.

    8) The heater box is split vertically in its center and is held together by two screw nuts. One you can see by looking through the glove box opening, the other is about six inches below it. Remove these and open the heater box to the right to expose the heater core.

    9) The core is held in place by an end bracket secured by two screw nuts. Remove this bracket and give the core a good wiggle and pull it out and down into the cabin as best you can. You are pulling the hose stubs through the fire wall and it will come out.

    10) The replacement core should come with a new bracket and air seals. Looking inside the box, where the core was you will see four strips of foam surrounding the opening. These should be replaced. It's tight in there, but take your time.

    11) Install the new core once the air seals are replaced and secure it with the new bracket. Then go out and hook up those heater hoses. You are going to be pushing and twisting, but get them home and tighten the clamps well. With this done go back inside and give the core a good push towards the firewall. Recheck the bracket. The core should be in there firm as a rock.

    12) All that's left is to put things back together in reverse of taking it apart.


    Not bad 'eh? Book says two hour job, good luck. I've attached a pic showing how my core failed. Not what I expected.
    Attached Images

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  3. #2
    xxcaddytech is offline Cadillac Owners Member
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    Re: heater core replacemant

    man 2hrs is draggin! i used to do them in 20-30 min! of course i've done hundreds! lol thank god no more!

    p.s great artical for the newbies!

  4. #3
    clarkz71's Avatar
    clarkz71 is offline Cadillac Owners Connoisseur
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    Re: heater core replacemant

    20 to 30 min huh?? Is that including getting the RO from dispatch, going to parts, and getting the car in your bay? Damn.

  5. #4
    AlBundy's Avatar
    AlBundy is offline Cadillac Owners Connoisseur
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    Re: heater core replacemant

    I thought it was mentioned that the engine had to be tilted forward in order to get to the heater core or is it the blower motor?

  6. #5
    xxcaddytech is offline Cadillac Owners Member
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    Re: heater core replacemant

    electronic ro-- no dispatcher--- parts in stock. stall 20ft from parts counter. car on svc drive...yep 20-30 min...i think it paid 2.5-3.0hrs flat rate but i could be off on the flat rate. BUT thank god no more! lol
    one of my friends works at ---rbm of atl--- mercedes dealer-- used to work at caddy said that the mercedes is a real p.o.s.. is it true?

  7. #6
    clarkz71's Avatar
    clarkz71 is offline Cadillac Owners Connoisseur
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    Re: heater core replacemant

    No more then any other car, although my Caddy has had no problems at all. Mercedes are very well engineered, it's the out sourced parts that suck. Window switch's, regulators, engine mounts, ect. It's funny, I have to do a heater core for someone this saturday on a 97 Seville. I'll post how long it takes me.

  8. #7
    thaddaeus is offline Cadillac Owners Member
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    Re: heater core replacemant

    Is this process very different from replacing the heater core on a 95 cadillac seville sts?

  9. #8
    piedpiper is offline Cadillac Owners Member
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    Re: heater core replacemant

    Krimson cardinal thanks used this to replace the heater core in my 97 Deville did it in about an hour removing and replacing and it was my first time replacing a heater core Thanks Krimson cardinal
    casper97cadi and casper97cadi like this.

  10. #9
    bradmo is offline Cadillac Owners Member
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    Re: heater core replacemant

    Wow! Thanks, I need to do a '95 DeVille this week.

  11. #10
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: heater core replacemant

    Quote Originally Posted by ALBUNDY View Post
    I thought it was mentioned that the engine had to be tilted forward in order to get to the heater core or is it the blower motor?
    You're thinking of the blower motor.

  12. #11
    Krazy is offline Cadillac Owners Member
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    Re: heater core replacemant

    Thanks, going to work on this sometime this week..sorry to bump an old thread, but this is really a great tutorial on replacing the heater core. Going to print off now. Thanks again

  13. #12
    97ELDO1 is offline Cadillac Owners Member
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    Re: heater core replacemant

    Your htr core replacement might help me determine if i can replace the ac evaporator core in my 97 eldorado! I hve been unable to date to locate any information on the removal of the evaporator. Did you see it when you removed the htr core? Cadillac does not even show or mention it in their chilton information book. Please give me any info you guys may have on the removal of the evaporator. Thanks.

  14. #13
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: heater core replacemant

    This section is for Tips, not questions. You'll get more help posting in the Seville/Eldo forum.

    Cadillac does not even show or mention it in their chilton information book.
    Chiltons and Haynes are not put out or written by Cadillac or GM and are useless for all but the most basic of repairs. Get a GM FSM by Helm Inc.

  15. #14
    crazybones2084 is offline Cadillac Owners Member
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    Re: heater core replacemant

    well this thread really helped me get the job done in an hour ! thanks man step by step and was done in a jiffy ! accurate to the t.......
    casper97cadi and casper97cadi like this.

  16. #15
    appachi is offline Cadillac Owners Member
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    Re: heater core replacemant

    All i can say is woooooooooooooooow, its great to know there are people like you out there, if it were not for your thoughtfulness i would have been screwed, thanks for savin me some big bucks.
    casper97cadi and casper97cadi like this.

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