Removing Heater A/C Box and Have Questions

Heating, Cooling & AC

  1. 6T8 Charger

    6T8 Charger Member

    Messages:
    7
    Likes Received:
    3
    Joined:
    May 13, 2022
    Location:
    Garden Home OR
    Local Time:
    4:50 PM
    I got my 383 Charger running yesterday and noticed steam coming from the defrost vents. I knew that wasn't good. I let the motor run until the thermostat opened (which it did!) and then looked inside the car to see coolant dripping down from the heater box and puddling on bare floorboards (car had no carpet or interior installed). I don't see how I can replace the heater core without removing the entire box. I removed the heater control valve and the 4 nuts that secure the box to the firewall and it started to come out but if feels like something on driver side is hanging up and stopping it. I have removed much of the dash stuff like the glove box, gauge pod, heater controls, radio, etc. Any suggestions? TY
     
  2. LowBikeMike

    LowBikeMike Well-Known Member

    Messages:
    214
    Likes Received:
    168
    Joined:
    Nov 28, 2020
    Location:
    St Louis, Mo
    Local Time:
    6:50 PM
    The entire box does not need to be removed, just the front half (piece with defroster outlets). The service manual details the process. The Heater core is attached to the front half. Its a tough job but doable. When you have heater core out, send it to Glen Ray for repair, as none of the aftermarket fit properly. Taking the heater control valve out is not necessary, but when removing you are probably feeling the control cable or capillary tube wire holding it back a bit. When you have front of box off that is the time to do any underdash work because it does afford you quite a bit more room (like replacing dash wiring including bulkhead)
     
    • Thanks! Thanks! x 1
    • Agree Agree x 1
    • 6T8 Charger

      6T8 Charger Member

      Messages:
      7
      Likes Received:
      3
      Joined:
      May 13, 2022
      Location:
      Garden Home OR
      Local Time:
      4:50 PM
      My service manual showed up in the mail box after I posted this. It says to remove the front cover of the case and the heater core will come out, so I will try that. Once I get the core out, I will need Glen Ray's contact information. Thank you LBM!
       
    • R413

      R413 Well-Known Member

      Messages:
      2,963
      Likes Received:
      6131
      Joined:
      Feb 4, 2019
      Location:
      NW USA
      Local Time:
      4:50 PM
      There are more leak points than just the core. The core might be fine. There are o-rings on the end of the supply pipes on right side, another valve inside and a short piece of 5/8” heater hose or two.

      You won’t believe what you will be seeing insode there.
       
      • Agree Agree x 1
      • 6T8 Charger

        6T8 Charger Member

        Messages:
        7
        Likes Received:
        3
        Joined:
        May 13, 2022
        Location:
        Garden Home OR
        Local Time:
        4:50 PM
        I'm in the process of taking the front cover off the case and there's vacuum hoses and linkages everywhere, all kinds of good stuff! I can already see there were some critters nesting inside the a/c door by the heater core. This should be interesting.
         
      • 6T8 Charger

        6T8 Charger Member

        Messages:
        7
        Likes Received:
        3
        Joined:
        May 13, 2022
        Location:
        Garden Home OR
        Local Time:
        4:50 PM
        I pulled the cover off the case and it was kinda disgusting. Mice had taken up residence and there was all kinds of gross inside the case. I found acorns, a Bic lighter and a chrome lug nut in there (plus all the mouse droppings)! An old hair brush was lodged inside the ducting. My defrost dash vents are broken so I think things could fall all the way down inside the unit. It's bad. I have removed the entire case for cleaning.

        View attachment 1285138 20220515_090413.jpg 20220515_090616.jpg 20220515_090456.jpg 20220515_090635.jpg
         
        Last edited: May 15, 2022
      • Mopar2u

        Mopar2u Member

        Messages:
        6
        Likes Received:
        12
        Joined:
        Aug 8, 2021
        Location:
        Pomona, CA
        Local Time:
        4:50 PM
        My hairbrush! LOL
         
        • Like Like x 1
        • Kilrbee

          Kilrbee Well-Known Member

          Messages:
          240
          Likes Received:
          113
          Joined:
          May 12, 2014
          Location:
          Wisconsin
          Local Time:
          6:50 PM
          • Agree Agree x 2
          • Durandal25

            Durandal25 FBBO Gold Member FBBO Gold Member

            Messages:
            3,108
            Likes Received:
            3201
            Joined:
            Aug 29, 2011
            Location:
            Texas
            Local Time:
            6:50 PM
            If you have no interior, take the whole sucker out and rebuild it completely. Kit from DMT is awesome and it will get that thing fresh and complete. Obviously you may need a new core......but not chunk the old one.....keep it for comparison........non A/C car? If A/C....then the rebuild will be more in depth......but also very straight forward........
             
          • 6T8 Charger

            6T8 Charger Member

            Messages:
            7
            Likes Received:
            3
            Joined:
            May 13, 2022
            Location:
            Garden Home OR
            Local Time:
            4:50 PM
            Contacted Glen-ray Radiators. $400 for heater re-core. He also suggested that I send the a/c evaporator so he can pressure test it. He says that most of the time they're fine but while I've got the entire unit out, it sounds like a good idea. $50 for that. So total with shipping probably $550 which seems reasonable.
            Turnaround time is 3 to 4 weeks.
            The guy was nice and very helpful on the phone, I was impressed.
             
            Last edited: May 16, 2022
            • Like Like x 2
            • Agree Agree x 1
            • LowBikeMike

              LowBikeMike Well-Known Member

              Messages:
              214
              Likes Received:
              168
              Joined:
              Nov 28, 2020
              Location:
              St Louis, Mo
              Local Time:
              6:50 PM
              Now is also a good time to determine if the water valve on the firewall functions and have it rebuilt if necessary. It most likely leaks internally.
               
            • 6T8 Charger

              6T8 Charger Member

              Messages:
              7
              Likes Received:
              3
              Joined:
              May 13, 2022
              Location:
              Garden Home OR
              Local Time:
              4:50 PM
              I'm no heating/cooling engineer, but to me, the o-ring concept at the inlet/outlet water tubes looks like a design flaw. Hose clamps are one thing, but those o-rings look like a weak link in the design process. I'm sure they had a reason at the time for doing it that way but we know what happens when o-rings fail.
               
              Last edited: May 16, 2022
            • LowBikeMike

              LowBikeMike Well-Known Member

              Messages:
              214
              Likes Received:
              168
              Joined:
              Nov 28, 2020
              Location:
              St Louis, Mo
              Local Time:
              6:50 PM
              The O-Rings actually work pretty decent. Make sure they are fitted properly, and lube them before inserting the pipes. Also, make sure the screws holding the pipes to the box are tight, keeping the joint from moving. I believe will Glen Ray provide a couple of new O-Rings when they restore your heater core. If you buy the box restoration kit from Detroit Muscle Tech he also supplies the O-Rings and some lube. I ended up using the DMT O-rings on mine, I thought they fit better.
               
              • Like Like x 1
              • Agree Agree x 1
              1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
                By continuing to use this site, you are consenting to our use of cookies.