So I was gonna recharge the a/c but when I looked around I noticed a lot of air blowing from this black device that the a/c lines come out of. Is this normal, something else or is their a leak in the a/c?
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unless you were using a decent dual gauge filling setup you wont notice anything untill you shutoff the car and let the system equalize (keep in mind ambient and condensor temps play a big part in system pressure). its not uncommon for the low side to just stay at low pressure while filling (it can jump up if you flip the can over to fill with liquid vs the evaporating gas)...but the high pressure side will rise, you wont see it on those cheapie low side only setups.
you prob need more to get to a full charge