I am actually surprised there hasn't been more response to this topic since there are countless questions on this board regarding the cooling ability of 134a. In any event, I basically totally rebuilt my system because it wasn't working when I purchased the car and I didn't know why it stopped working in the first place. I replaced the receiver/drier, expansion valve, compressor, pressure switch, condensor and all the hoses. I replaced the condensor with a universal parallel-flow condensor from www.ackits.com, which probably is the key factor to getting the temperatures I am getting. I think the other factor is that I filled the system according to pressure (using a/c gauges). Too many people talk about buying the kits at Autozone and filling until "there are no more bubbles in the sight glass." The sight glass means NOTHING; pressures, measured with gauges, mean everything.

Lastly, before I did the conversion I was concerned about the electric fan. I noticed that most modern cars are wired to automatically turn on the electric fans whenever the a/c compressor is engaged, which contributes to proper cooling with 134a. Maybe it was because it was so hot outside, but I realized my electric fan is also on most of the time the a/c is on, so I don't see any reason to alter the original wiring or install an aftermarket fan (like I had originally planned to do).

Greg
'84 300D