Aircon blockage?

[Cole]

My aircon is underperforming, all the controls work but the air is simply not cool enough (it is cooling, but not by much). The fan blows strong and my micro filter is not clogged. I also do not think the problem is related to the FSR as the fans work correctly. Aux fan also seems to be working.

I have taken the X5 to an indi to check the gas levels and he claims the gas pressure is fine, but he believes that I have a blockage in the system. He suspects the drier, but says that the drier and condenser are now one unit so I need to replace the combined condenser/drier. He also recommends that I replace the expansion valve for good measure.

My problem is that I am out in the sticks and the nearest BMW dealer is 800kms away. I can order parts but I am reluctant to get all these (expensive) items if they are not going to resolve the issue. Does anyone have any advice as to the likelihood of my problem really being due to the condenser/drier being blocked.... does this sound plausible?