| The key to keeping the AC vent temperatures down is the condensor and the airflow through it. I live in the Phoenix area and I converted both my Z32s over to R134a. When I converted over to R134a, I installed a parallel condenser from later model Z32 that came factory with R134a. I just picked one up at the local junk yard for cheap and installed it. I did find ones that were in great shape and made sure to flush it out real well before the installation. Next key... air through the condenser. You will need to find a way to get the front pusher fan to turn on at a lower temperature. I did this by lowering the turn on temp in the ECUs EPROM (chip) by 10 degrees C. I would advise against just wiring and leaving the front pusher fan turned on all the time as it is designed to turn off automatically when the car reaches 25 mph. The pusher fan was really designed to turn on if the car's coolant temperature was beginning to get too high. I just changed this setting to allow the pusher fan to assist with the A/C at a lower coolant temperature. The last thing I had to do on both of my cars was remove the suction throttle valve. I believe this is only on cars with climate contol... manual A/C control may not have an STV. The R12's STV does not work correctly with R134a. But, this modification has it's drawbacks. As the car uses the STV to basically turn off the AC when the evaporator gets too cold to keep it from freezing up into a block of ice instead of turning the compressor on and off. The plus side of this modification is that this allows the pressure drop to completely happen at the expansion valve where it's supposed to happen.... with no back pressure behind the evaporator caused by the STV. In stop and go traffic in Arizona, without that front pusher fan turning on while you are stopped, the AC conversion will not keep up as well. If you have a socketed EPROM (chip) in your ECU, you may be able to have your EPROM supplier change this setting for you and give you a new EPROM. Let me know if you would like to try this and I will provide you with the address information needed to lower those turn on values. You can then ask your EPROM supplier to make that change for you and give you a new EPROM. -hope this helps
Jamie
the_s_man@juno.com
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