Is there any easy way to find out? Or should I have a shop empty and service the freon? I know the oils used in the systems are not compatible. The only way I know of is when the shop does put a R134A sticker or mark the system R134A. Otherwise the smart move would be have a shop evacuate both the ...

Get the battery on a charger so that’s it is at 100% SOC before chasing down esoterica. Electronics hate saggy voltages and a compromised ignition will give you lots of demons and angels to chase