Fiat 500 Manual page 43

11) Never use R12 or R134a coolant, which is not compatible with climate control system components.
2) The system uses R1234yf coolant, which is compatible with the laws in force in the countries where the vehicle is sold. When charging, only
use the gas indicated on the dedicated plate in the engine compartment . The use of other coolants affects the efficiency and condition of the
system. The lubricant used for the compressor is also strictly linked to the type of cooling gas, please refer to a Fiat Dealership.
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IMPORTANT
IMPORTANT