Where is the low pressure a/c fitting located in relation to the hp fitting?

Hello, Any technician knows that if you need refrigerant filled due to normal operation, there is a leak. The A/C shop should never have filled it for you, and the only reason they would is by customer demand, ignorance, or unethical practice. Using a sealant for the system will cause more harm than good. They seldom fix a leak, and always cause clogs in the system. Also, if there is evidence of a sealant being applied, many sops may refuse to service the system because it may cause damage to their expensive evacuation and recharge equipment. That being said, the high pressure side runs from the compressor, to the condenser, and eventually into the firewall. The high side fitting will be between the firewall and the condenser which hangs on the radiator. The low pressure side will run from the firewall, through a couple of other component and back to the compressor. The low side port will be on that line, so follow the low pressure line from the firewall until you spot it. They are sometimes not easy to locate.