Hi Guys,

A few weeks earlier, one of my Thermo King reefer units stopped working because its engine overheated. The engine was overhauled afterwards. Here is my problem. My Thermo King X426 compressor uses the R403b refrigerant. The R403b refrigerant, unfortunately, is not available here in our place. I checked some info on the internet and I found out that it is possible to use R12 or R502. Is it ok to use these two refrigerants instead of R403b?

What do you guys think? Thanks!