Q. on leaking freon gas. Seems to me if air not cold, then freon in short supply. But where is the most common point of leakage, is the gas under constant pressure, is the pressure considered 'high' or 'low' pressure, etc, etc and resulting in: how long can a leak remain undetected since if the gas is under constant pressure then leak will continue until tank empty and then only warm air will be circulated.
Up to date models may use an alternative gas, freon is an older refrigerant gas.