Tech QuestionCraig Robertson, Utica, MI, 1975 Dodge Dart Swinger 318 V-8 I am replacing a heater box and controls in my 1975 Dodge Dart. The only thing that I can find that is in good shape and not missing pieces is a complete unit with controls from a 1973 Plymouth Duster. My 75 system is for a/c, but the a/c is gone. The 73 is not an a/c system. Will the swap fit or am I going to have issues? Please advise. Craig, if you have EVERYTHING from the '73, including the box, core, blower, cables, control / switch, etc., it will work. But you'll almost certainly need to make new holes for the core's nipples in the firewall. Probably the easiest way to do this is to bolt up the outer half of the box (empty), and mark the hole-center locations, then drill small holes from the inside, then hole-saw from the engine side. Pluggin the old core nipple and evap lines holes will be up to you. Correct, of course, would be welding in steel patches. Sleazy would be tape, be it duct or aluminum foil. You'll need to ditch all the A/C ducting, obviously. Defroster hoses should be the same. This is a miserable job, but not especially difficult. Rick
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