I know, I know. A lot of info, but without it you won't know what I'm dealing with. Evacuated and charged the A/C system on my 84 C10 and I'm having issues that I've never experienced before on any vehicle. Of course, it's a kluge, so I should've expected to run into some problems. It cools, but no colder than 82° at idle and it's got very high pressures. System was previously converted to R134 with the 305 engine and worked fine until I opened it up last August to swap in my 5.3 LS engine. Setup: Aftermarket fans with shroud which turn on when A/C is switched on (not the compressor cycling) OEM evaporator OEM condenser NEW accumulator NEW Sanden SD7B10 compressor NEW custom suction and discharge hoses NEW orifice tube Blew as much oil as I could out of the evap and condenser since I don't know what was in it. Connected the hoses, but not until I added 6oz of PAG 46 into the system in various locations. Evacuated the system using a vacuum pump from Autozone. Pulled down to 28" of vacuum and left it for an hour. Started adding R134 with an outdoor temp of 94° and a jumper on my low side switch until I got 12oz into the system. Pressures at that time with clutch engaged: LOW = 28PSI HIGH = 160PSI Added my second can of R134. Low side jumper removed, but clutch was engaged 100% of the time as the pressure was too high for it to ever cycle off. Pressures now at: LOW = 60PSI HIGH = 230PSI Added most of my third can of R134, but quit due to the high pressures. Probably added 8oz or so. This means I only have 32oz of R134 in the system at most. From what I can tell, capacity is 44oz with R12, so it's technically still 20%-25% low... Clutch still engaged 100% of the time. Pressures now at: LOW = 90PSI HIGH = 330PSI Outside temp had climbed while charging and was around 98° by the time I finished. Interior vent temperature at idle is around 78° (give or take a few degrees), so not working too well. Drove the vehicle on surface streets as well as the freeway. Vent temp dropped to around 58°, but still not great considering. Any ideas on the cause for the high pressures? Thanks in advance!