Vintage air questions after install

[piecesparts]

All of the above is correct. The first thing is; an increase in temp out of the engine will most likely be noted, due to your changing the inlet air temp from the A/C coil. As for the 5.3 liking to run at 180 to 190 degrees, the new 2011 GMC that I am driving has a 5.3 and the temp is rock solid at 200 degrees whether or not the A/C is on, so the temp can be higher. If you were to look for an upgrade to your radiator, maybe an aluminum unit from an outlet like "Be Cool" , you could gain some more cooling surface effect. I don't know what fans you have or how they are mounted, but running them without some form of an air shroud to allow for efficiency in air movement is a loss of cooling ability. Unless you are traveling down the highway at some rate of speed that would allow for more air to push through the uncovered part of the radiator, then you are not using that part and the cooling temp will rise. The experience that I have seen with air conditioners that have R134 in them, the lines to the compressor usually have a good sweat on them but not frost as seen in your picture. That is something that is seen on many R12 units. Also with an overcharge on a R134 unit, the evap coil will frost over and finally the cab will lose air flow, due to the coil being plugged up with ice. The satement about R134 being different than R12 is true. With R134 the charge is very critical for operation to be right. The A/C unit may have a number on it that would tell you an close approximation of the ounces of freon needed to do the charge on the system properly, if not, then it will be a trial and error process. Of course the install will have to consider the length of the lines and the size of the evaporator, condenser, and accumulator size you have.