Yeah I agree on the loss of pressure being too fast for normal. I'm taking it back to the same shop that did the original recharge and did put dye in, so I'll ask that they take a look.

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'08 X5 4.8i - 196k
'15 i3 REX - 95k - Blown AC compressor

'98 323is - 170k - Garaged
'94 325i - 208k - Sold