if your recharge kit does not have a quick disconnect fitting, compare the tubing size going to each A/C charging port. This thicker tubing is the low-pressure line and is used for recharging.

Luckily, these top kits are the best ... to be impossible to recharge your air conditioning. In order to refill the coolant, you need to connect a hose from the Freon to the low-pressure port ...

2. Refrigerant recharging kit To recharge your AC yourself, get a recharging kit, which will include a can of pressurized refrigerant (aka freon) and a pressure gauge (measuring in PSI).