Did I MIS-DIAGNOSE This Mercedes?? (GL450 no A/C)

Uh oh... The 2012 Mercedes Benz GL450 is back with a no A/C complaint. Owner wants it fixed ASAP because he's taking his family to sweaty South Carolina in a few days. He already replaced the A/C compressor, but obviously that didn't fix the problem. I perform the diagnosis and make a recommendation. The owner follows through, but STILL NO A/C!! Did I make a BAD CALL? Or was the replacement used part DEFECTIVE?? ASTRO DVOM: https://www.amazon.com/dp/B07FDBW1PT?... THINKTOOL PROS: ***$170 OFF!!*** https://www.amazon.com/dp/B08XXWHQVJ?... Enjoy! Ivan