[lust4speed]

My red '67 GTO came with factory air. Was converted to 134a and that simply sucked. I spent $2,200 two decades ago replacing everything with NOS parts and going back to R12. Finished product was comfortable as long as it was on recirculate and max fan. It spent every summer on max high recirculate. Main problem was air output - or the lack of. At least a total of four different fans were tried and I went back and double sealed all the joints and re-foamed the diverter doors. Again a comfortable system, but I haven't been in any early GTO that had good air output out the vents.

On my blue '67 GTO that never had AC I went with a Vintage Air Mark IV system. I told the rep that I wanted to oversize the condenser and compressor and his answer was simply "trust me, the standard ones are great". I installed the system six years ago and it is still freezing me out of the car. Unlike the original system that needed to stay on max, I'm reaching down and turning down the fan speed and cranking up the temp within five minutes even on 100°+ days.

Oh, and weight. I weighed the complete Vintage Air system including the cans of Freon and everything weighed 54.78 pounds. The old A6 compressor by itself weighs 33.36 pounds.

I chose the Mark IV under dash unit because my original heater was working fine.