Anyone knows r134a and refrigerant oil amount in Chevy Cobalt A/C system? Thanks?

Unless you emptied the compressor you should be ok on oil. As for 134R check under the hood and there should be s able with that info. Alternately you can buy a manual which will come in handy if you intend to keep or service this type vehicle.

Anyone knows r134a and refrigerant oil amount in Chevy Cobalt A/C system? Thanks?
NAPA has a listing in ounces of oil for each part you replace. as for the freon charge weight its on a sticker under the hood and in the owners manual . remember if you trashed a compressor replace the orifice tube.