The amount of Freon (aka refrigerant) that a typical car's AC unit can hold will vary from one car to the next. In total, most cars should be able to hold somewhere around 28 to 32 ounces of Freon. This equates to about 2 to 3 12oz cans of Freon if you're curious to recharge the refrigerant yourself. Although, some vehicles might be able to hold more Freon than that. Usually, luxury cars with advanced or beefy AC units will often carry more refrigerant. If you need to find a more precise quote, the owner's or repair manual should contain data on the exact amount of Freon that your particular car's AC can hold.