Faulty FSR or low AC gas

[Christiano]

I'm having the exactlysame problem with my 2006 4.8is. Driver's side cold, passenger side normal to hot. It's summer here (+25~+35 Celsius) and the AC is On all the time. I take the car to AC Shop and they filled the gas on the first time. Two weeks later, the hot passenger side back and they make a lot of pressure test and nothing, no leaks again, just the AC with a little less gas than needed (940g x 900g). The guy did the same, filled the gas and both sides cold again. Two weeks past until now and today, guess what? Yes, again. Tomorrow I'll back there...