76 Scamp A/C

Along with 40 year old hoses your system may have been overcharged, 36 OZ of R-134A is equal to the R-12 capacity and you usually use less R-134A in a conversion, especially with the original serial flow condenser. You have to watch your discharge side pressure on a converted system. High ambient temperatures with too small a condenser for R-134A can cause the discharge pressures to get really high. The EPA mandates a high pressure cut off switch on converted systems although many times the switch is not installed.