Wraith AC sounds like a jet engine spooling up and then nothing, anyone in Sharjah actually fixed this

[oliviabrown]

I picked up a 2015 Wraith a few months back from a private collector in Dubai and the car is absolutely stunning and the power is ridiculous but there's this one thing that's been driving me up the wall and it's the air conditioning, specifically when I first start the car in my building's parking in Al Nahda Sharjah the AC compressor or something makes this loud whining noise like a small turbine starting up and then after about thirty seconds it goes completely silent and the air from the vents starts off coolish and then just fades to ambient temperature within five minutes of driving, and if I'm stuck in traffic on Al Ittihad Road it never recovers and I'm just sitting there in a cloud of my own frustration while the leather seats slowly cook me alive. I had a mobile mechanic come take a look and he hooked up his gauges and said the system pressure looked a bit low but he couldn't find an obvious leak and he wasn't comfortable working on a Rolls Royce which I honestly respected him for admitting, but now I'm stuck because I know these cars share a lot of HVAC components with the BMW 7 Series of the same era so it shouldn't be rocket science to diagnose but I also don't want some random shop learning on my car. I've been trying to find Certified Rolls-Royce AC Mechanics in Sharjah who actually know how to access the compressor and condenser on these Wraiths without removing the entire front bumper unnecessarily and can do a proper leak test with nitrogen and maybe check the compressor clutch gap because I've read that can cause intermittent cooling if it's worn. Anyone else on this side of the creek ever had a similar AC whine and fade issue on a Wraith or Ghost and found a shop that actually figured it out without just guessing and throwing expensive parts at the problem until something stuck.