THIS USER ASKED 👇
What was a key design change for hfc-134a a/c system versus cfc-12 a/c systems?
THIS IS THE BEST ANSWER 👇
I believe the answer is: quick fitting of couple service and the design reduces ventilation and refrigerant mixing during service.
hfc-134a has a better refrigeration and mixing process compared to the cfc-12 a / c system. This reduces the toxicity level of the air conditioner allowing the air conditioner to be installed in a small / confined space such as cars