Chrysler put Dual Air Conditioning in a lot of cars, notably the Imperial and the T&C Wagons. Additionally, Chrysler "Airtemp" is what comes into my mind when I think of what A/C should be: Think lots of cold air, condensation on the die-cast metal vents, and Max AC!!! I never owned a Dual Air equipped car, but my guess is that these cars must have been like refrigerators on wheels! Was this a needed option? What with such a great system to begin with, I wonder why they went to the trouble to add a second system? When the second system was part of an Auto Temp system would there be a second set of controls for the rear system? Maybe the rear system was a carry over from the years when A/C first appeared in cars, usually on the rear deck, and they just kept it there as an option while adding the front system? Just the ramblings of my mind...... Ed