only authorized machine shops can do this due to enviromental concerns
R12
well unless you are certified to work on automotive a/c systems you can't even buy freon
To add freon to a 1989 Bronco II with a 2.9L engine, locate the low-pressure service port on the air conditioning system. The low-pressure port is typically found on the larger diameter aluminum line, which runs from the compressor to the evaporator. Remove the cap from the port, connect the refrigerant charging hose, and follow the instructions provided with the freon canister to add the refrigerant. Always ensure the A/C system is off while adding freon and check for any leaks after the process.
If it hasn't been coverted to R134 it will have to beBuy a kit at Wal-Mart or auto parts comes with instructions
R134a
You don't add Freon as it has R134a not Freon. You add it to the low pressure side which is the larger hose.
Take it to the a auot shop. you can not add freon
Contains no Freon. Freon was banned beginning in 1996.
If low on Freon it will short cycle. Sensor knows it is low on pressure. Add freon and see if problem goes away.
To add freon to the air conditioner on a 1989 Toyota SR5 Pickup, locate the low-pressure service port, which is typically found on the larger diameter aluminum line running from the compressor to the evaporator. Remove the cap from the service port and connect the refrigerant can's hose to it. Make sure the engine is running and the AC is set to the maximum setting while you add freon. Always check the manufacturer's specifications for the correct type and amount of refrigerant.
check the back of the compressor, they hide the there on the older models. volvodoctor
where do I add freon to my air conditioning unit on a 1997 chevy truck?