What type of refrigerant does a 1990 corvette take for its air conditioning?
Your 1990 has R12 refrigerant in it which isnt available anymore at parts stores. To add refrigerant to your vehicle you will have to get the a/c system vaccuumed and retrofitted to accept new r134a refrigerant and pag100 compressor oil. You can take it to a shop to get it vaccuumed and retrofit it yourself with kits from your local Autozone.