How well does R-134a work in an R-12 system?
On most vehicles the air coming out the vent will be the same. On some vehicles the R-134a air will be a couple of degrees colder. On some other vehicles (rear wheel drive domestic vehicles) the duct temperature may be 2-4 degrees warmer. This is considered an insignificant amount, and based on our experience selling over 10 million of retrofit kits since 1997, users are extremely satisfied with the results. Why does Interdynamics use Ester Oil instead of PAG Oil? While both lubricants are used with R-134a, Ester is believed to be better for Retrofit systems because they are much less hygroscopic, which means that they don’t absorb as much water from the atmosphere as PAG Oils do. This moisture can create problems in a vehicle’s A/C system. Ester is also a truly Universal lubricant which has a Single Viscosity. PAG Oils come in a variety of viscosities which must be matched to the vehicle. GM vehicles use a high viscosity (150) PAG Oil, and non-GM vehicles use a low viscosity (46) PAG
