Dick Benjamin wrote: I'm wondering if any Imperial of the boxcar variety had genuine dual AC. I don't know the answer to that specific question, but the 67 Crown I parted had a rear heater. It consisted of a heater core, fan and duct work. Hot water from the cooling system ran in reinforced pipes down the edge of the undercarriage and into the trunk. There was a control on the dash for fan speeds but I don't remember where the temperature control was. Ken Miller