> I know I'd sure like to experience the difference (b/n an Imperial with the > rear air and without). None of mine have it. (sob) Sunny Florida checking in here.... When I had my '73 with rear air (converted to 134a) there were several occasions I left it idling from some odd reason with both a/c units running. In 95 degree heat it would get it cold enough for all the windows to sweat in about fifteen minutes. Amazing systems they put on those cars. Steve B.