What drivers need to be careful of is that we source the best servicing and parts we can for our cars,members on here take particular care of their cars ,washing them with two buckets and different sponges,with all sorts of shampoos and waxes,but when it comes to the aircon we go to any garage with a machine and pay £30-£45 to have it topped up,the problem is many of the people operating those machines have attended a one day course,on the scuttle of most mercedes is a little sticker with some numbers regarding the aircon,but these need to be converted into how much is put in to the system,it is very easy to blow the condenser,I always use a aircon specialist IntoCool in Essex they do have a mobile van that will venture out of the county.