Its a brand new compressor on my 134a system, which seems to work fine, however when I got the new compressor installed the A/C tech told me there was something going on with it (his words) and the pressure went up too high just a little above idle so he recommended an electric fan for whenever the a/c was running. That is what started me on the research trail and when I asked again the tech admitted that when rolling down the road and with good airflow over the coils the fan should be unnecessary but he couldn't say for certain.
All that led me to question whether, in the shop at 0 mph there would be no airflow across the coils therefore the pressure would rise but wouldn't rise if the car had proper airflow at highway speeds. Additionally, wouldn't the high pressure switch prevent the system from going too high and cut the compressor off in that event?
In hindsight I would say that if my system was functioning properly I wouldn't have to worry about installing an electric fan, but the a/c tech was pretty adamant that my compressor would die again without one. I am inclined to believe him because I have been to back to back EM's with a frozen and useless a/c compressor.
My fan clutch seems to be working fine as the car has no cooling issues either at idle or at highway speeds in the heat of the Florida summer. Just the a/c seems to be the repeat victim to the heat. That's why I am here for help.
Oh, the condenser is fairly clean and the system was serviced and the receiver/dryer and orifice tube were changed and the system was flushed and vacuumed before the replacement compressor was installed. Its a Pro6ten compressor. If this one fails I will most likely switch to the Sanden, but that means changing the mounts and brackets too.