2013 E70 Air Conditioning

[330volts]

Hi All,

I have a strange issue with my 2013 E70 with 98,000 miles. In the automatic mode the air conditioning throws cold air on the driver's side as well as the rear passengers, but the front passenger side top vent throws cold air, the front passenger top-side vent (next to the window) throws just about cool air, and the front passenger footwell throws hot air. When I setup the vents manually by configuring the passenger vent to direct cold air only to the upper body, the front passenger side top vent throws cold air but the front passenger top-side vent (next to the window) throws almost warm air.

As suggested by a few, I charged the system with 134a but did not see any difference, except the a/c compressor now makes relatively louder sound and fluctuates between higher and lower rev.

What can be the issue? Appreciate your direction and thanking you in anticipation.