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Another avenue it to make your own hardline.
I ordered fittings online, some a/c tubing and aluminum soldering kit - flux and rod - and I used a map gas torch. I havn't cleaned them up yet but still holding pressure for 3 years.
and yes the port can be used for a pressure sensor or you can...
After 3 hours I checked drained and checked the progress. It seems to be doing something so I'm gonna try it overnight. So the mixture is back in and setting in the driveway.
I have a 98 Dodge van and the radiator is dirty with the solder corroding so I research how to clean it. Prestone cleaners, CLR, vinegar, dish washing soap ect. I go to the pull a part and find another van radiator that needs cleaning and start the experiment.
It would mean you are evaporator in the area around it is working very well. You could also try insulating that area of the box with a little bit of dynamat or equivalent.
I've used a cheap adjustable air regulator and cobble up some fittings to get to the 1/2"heater hose and T into the loop on both ends of the core. Then a ball valve on the inlet to check for pressure loss. My cap is 18 lbs so I checked to 25.
Very cool.
I patched my a/c system together as well. I used a condenser from a mid 90's didn't truck and a sanden compressor. I have the high pressure switch at about 400 and the low at about 18. On a hundred degree day my center vent hits about 44° which is pretty good because I have nobody...
I've got a factory replacement 134 dryer from RockAuto that has worked fine for me. I've even had it up to 400 psi with no problems.
So no I don't think there's any difference.