R12 vs 134a

I added factory ac on my 69 cuda. I bought a new dryer & expansion valve on eBay. Dumped the oil out of the compressor & put new oil in. I put it all together & let it pump down overnight on the vacuum pump. I had a leak or two to find. Charged it with R134 and it works great.

Buy one of those $25 Freon leak detectors on Amazon & go to town!