If it has been converted, the kits come with a sticker. The inlet where the freon is put into the system should also have a refitted opening (plastic cap to fit the 134 fitting). Other than that, I cannot tell you how to tell the difference without taking it to a shop.
The re-fit, compressor and stuff for mine was about $300 and i did it myself. Thats when R-134 was about $2.50/can.
The re-fit, compressor and stuff for mine was about $300 and i did it myself. Thats when R-134 was about $2.50/can.