The low side port, which is the smaller one.
You add the refrigerant through the low side service port.
Buy a kit at Wal-Mart or auto parts comes with instructions
R134a
R12-if it has ac of course.
You can add Freon to your 2001 Buick Century air conditioning system through the low pressure port. The low pressure port can be found on the top of the air conditioner compressor.
R134a
In the low side ac service port.
freon usually goes on your condinser there should be a place to add collant on your condinser which is a silver cylinder
A dodge Durango uses r134a refrigerant. The capacity varies depending on the year and if it has rear air.
R-134a
The 2001 Dodge Durango has a V8 engine.
You do not want it to run on low freon as it will burn itself up. There is a low pressue switch that tells it not to run if the freon pressure is below a certain point. To make it run; add freon.