Other shop called back...they could not find any evidence of UV dye. And the system held vacuum as part of the machine's check before refilling. Said it's blowing cold and happy.

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

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