There are 2 valve where I add the freon to my 98 Isuzu Amigo, and I am not sure which one it is that I use?
You need to add the freon on the low side which is usually indicated by a blue cap. The red cap is the high side port. Never add freon using the high side port. Typically if you are buying a guage set from your local auto parts store, it will only attach to the low side service port because they are diffent types of connections. Another easy way to tell is to turn your AC on and feel the lines that the ports are attached to. The low side should be cold/cool and the high side will be hot.
The low side is the one you should use. It is the bigger of the two lines.
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