Converting to air conditioning

1971 - 1974 Mopars

  1. Evan Coleman

    Evan Coleman Member

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    I'm rebuilding a 1974 charger 400hp 4spd car. It does not have a/c. I have a mostly complete 74 charger 318/904 car with a/c. Also have access to a 1973 318/904 satellite which I believe has a/c. This is the car I would prefer to rob from. Did a little looking and the fire walls are different, blower motor mounts different, and heater hoses are in a different location, and likely more stuff I missed. I am assuming to do the swap to my 4spd car I would need a dash, heater a/c box and fire wall section, controls, ect, which I have. How much of the fire wall do i need you think? Can I just cut out the passenger side area roughly 17" wide, or is this an entire fire wall swap with other unforeseen obstacles? 20200125_172028-jpg.jpg 20200125_172324-jpg.jpg The car has been blasted and is sitting on a rotisserie, so now is probably the time to do it. Though I dont absolutely need a/c, it would be nice. This a relatively rare car for 74, but I dont think its overly valuable, so some departure from how it was equipped from the factory shouldn't be a big deal ??? I looked up a/c systems from classic air and vintage air, nothing for 71+ b body Thanks.
     
  2. Rusty 72

    Rusty 72 Well-Known Member

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    I would think you could just graft in the heat/ac section? I can't see the right side of the fire wall but would assume its the same between ac/non ac car. Is the dash different also between ac/non ac? This may be a much bigger job than it seems. Let us know how you come out for sure.
     
  3. 72RoadrunnerGTX

    72RoadrunnerGTX Well-Known Member

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    20130701_182637.jpg DSC00012.jpg
     
  4. Kern Dog

    Kern Dog FBBO Gold Member FBBO Gold Member

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    This may be a silly question, but....
    Have you checked with the aftermarket A/C suppliers? They may offer a kit to be used with the factory non A/C firewall that could save you some work.
     
  5. Evan Coleman

    Evan Coleman Member

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    Looks simple enough, pretty much what I had in mind, i was thinking of doing a little larger section, but that works, drill/cut out some new holes for a/c and heater lines, cover over old heater lines, and mount blower correctly. Slow going right now, but I'll try and post pics as I progress. Pretty sure the dash (metal frame is different.) My a/c car also has vents in the center area of dash on driver and pass side. I dont have it apart. Hoping none of the inner cowl area is different??? Thanks
     
  6. Evan Coleman

    Evan Coleman Member

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    None that I could find, only for older models
     
  7. Montclaire

    Montclaire Well-Known Member

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    There were changes between 73 and 74 in a lot of respects so if you have another 74 there with AC, that's what I'd be looking at.
     
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