How much freon in a 1976 Cadillac?

A 1976 Cadillac typically uses about 3 to 4 pounds of R12 freon for its air conditioning system. However, it's important to note that R12 is now considered a refrigerant that is harmful to the ozone layer and is largely banned. If servicing an older vehicle, it's advisable to consider retrofitting to a more environmentally friendly refrigerant, such as R134a, which may require modifications to the system. Always consult a professional for proper handling and servicing.