Passat AC works fine for twenty minutes then starts blowing warm, anyone know a good VW shop in Sharjah-Forum-Culture Informatique

I’ve got a 2016 Passat 2.5 that’s been in the family since new and it’s always been a solid commuter for getting from Sharjah to Dubai and back but the last couple of weeks the air conditioning has been playing this really annoying game where it’ll start off perfectly cold when I leave my apartment in Al Taawun and I’ll be thinking great today is a good day and then somewhere around the twenty minute mark right when I’m getting onto the E311 the air from the vents just slowly starts getting warmer and warmer until I’m basically just circulating ambient air and the only way to get it cold again is to park and let the car sit for an hour which is obviously not happening when I’m on the highway. I had a guy at a garage near the BMW Road hook up his gauges and he said the pressures looked fine and the compressor was engaging and maybe it was just a weak compressor clutch but he didn’t seem super confident and I’m not about to throw parts at a guess. I’ve been reading on VW Vortex that sometimes the RCV valve inside the compressor fails on these cars and causes exactly this kind of gradual cooling loss once everything heats up and it’s a relatively cheap fix if you find a shop that actually knows these systems instead of just quoting a whole new compressor job. I’ve been searching around for a Sharjah Volkswagen AC Trusted Service Workshop  that can actually diagnose this intermittent cooling issue properly with the right tools and maybe pull the compressor and check the valve without charging me dealership money for what might be a few hundred dirham fix. Anyone else with a Passat or a Jetta dealt with AC that fades out after twenty minutes and actually got it sorted on this side of the creek without just replacing the entire system out of frustration.