Where is the low pressure orfice for adding freon I know on larger line from compressor Is this axcessed under car or where?

The low-pressure port for adding refrigerant (commonly called freon, though that's an outdated term) to a car's air conditioning system is typically located on the smaller diameter line near the evaporator. This is usually the suction line, running from the evaporator to the compressor.

It's not on the larger line from the compressor (the discharge line). That line carries high-pressure refrigerant.

The location is usually under the hood, but sometimes it might be somewhat difficult to access depending on the vehicle's design. It's often near the air conditioning compressor or other components in that area.

The low-pressure port will be one of two or three ports you'll find, usually with colored caps:

* Low-pressure port: Usually blue.

* High-pressure port: Usually red.

* Service port (for vacuuming): Sometimes present and may be yellow or another color.

You should never attempt to add refrigerant yourself unless you have the proper tools and knowledge. Improperly adding refrigerant can damage the system and void any warranties. It's best to take your vehicle to a qualified automotive technician for air conditioning service.