so i got ahold of a gauge and no pressure. leak! what is the best way to determine the leak, i see freon with uv leak detection, anyone used this? also how many cans should you do if you are filling up an empty system? cans go up or down during filling? i think valve up is suppose to be gas and valve down is supposed to be oil i think is what i've heard but how much do you need of each and how do you decide?
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