I too converted my R12 to R134a. I ordered an O-ring kit, conversion kit and filter drier from Amazon, about $60 total. I let an A/C tech evacuate the old R12. He did it for free. He will clean it and resell for big $. I picked up a vacuum pump and gauges from O'Reilly's, free rental. Replaced O-rings at condenser and compressor. Replaced low and High pressure ports, which is the conversion kit. Pulled and held a vacuum, so no leaks. Added freon, R134a with PAG oil to spec. Whole job done in a day. Now I have cold A/C, 62 degrees at vent. One negative is that the 87' toyota doesn't have a high output blower fan. On a hot day it will work to cool thej cab. You will need to seal off the rest of the RV to contain the A/C air.? Also, it does rob the engine of a few HP.? This may matter to us 4 cylinder folks.?
On and opposing note. If you do not intend to have A/C, I'd remove the condenser coil to improve radiator cooling. I'd also remove the compressor belt to improve HP. Also remove the compressor for weight. You can always reinstall these items when you sell.?
