How can you tell if your refrigerator has freon or 134 A in it?

Answer 1

When you say "Freon", I'm going to assume that you're using that (incorrectly) to refer to R-12/CFC-12. Freon is actually a patented trademark of DuPont for a line of CFC and HFC refrigerants which they produce and market under the Freon name - thus, it's not actually Freon unless it's made by DuPont and marketed under that name.

The age of your refrigerator should tell you something in this regard - yours would probably have R12 if it was manufactured before 1995. From 1995 onwards, R134a (HFC-134) began to be used in refrigerators. In more recent years, other refrigerants such as R-600a has come into use, while many large industrial refrigerators still use pure ammonia (which R12 was developed in the 1930s to replace in household refrigerators).

Ultimately, your best way of getting a definitive answer in regards to your refrigerator is to contact the customer service department of the company which manufactured your refrigerator.