My 2003 XR6T has developed an aircon issue. About 3 months ago I noticed a thump noise when even I turned the aircon on to the max setting. It seems to be coming from around the front passenger's footwell; it only happened for first time I turned the aircon on after starting the car. Also, over the past few months there has occasionally been a mist coming out of the centre vents, more so from the one on the right; I just thought this might be condensation on very hot days. Now, however, over the past two days (when have been around 35 degrees outside) the aircon has to be on max to get anything cool out of it and even then, for the first 20 minutes there's only cold air from all driver's side vents (including the rear one), there's only hot air from all the passenger vents (including the one on the rear) for that firtst 20 minutes and when it does eventually become cool it's nowhere near as cold as the driver's side vents. Can anyone shine a light on what the issue might be here so I don't get ripped off by a ford service department. In advance, my sincere appreciation for assistance.