An elderly neighbour's car has Air conditioning which is not as cold as it used to be. They booked it in to one of the major tyre and exhaust centres that offer re-gassing and after an hour and a half returned to collect the car. The Technician who had carried out the procedure said that it was full of refrigerant gas when checked but they had drained 810mls and refilled it with the same amount but the temperature at the vents had not changed "so it must be the compressor or some sensor or possibly wiring at fault" He then suggested a cost of "around £800 or so" to fix it. A little shocked by this our neighbour left and drove home only to find that the previously working (although not as efficient as it was) A/C was now completely non functioning on what was a very hot day giving them a very uncomfortable journey home. Somewhat confused by what had happened they called around to ask for advice on how to proceed. On hearing the story I called the business to ask why a working although under par system was now not working at all. The Manager just kept telling me that the machine that re-gasses is automatic, they just plug it in and follow he screen prompts and that 810ml of gas was removed and replaced. When asked why the system was now unable to supply any cooled air he just repeated his original mantra. Clearly the only way to resolve it was to return so I accompanied our neighbour on a rather hot and uncomfortable journey where we met the Manager who repeated his previous statement and was waving the report at us. I asked to see the Technician who had performed the work and when he arrived asked him to explain why he gave back the car in a worse state than when it was given to him. He tried repeating the "we drained it and refilled it" story but I was becoming rather tired of this so asked him directly what the problem was, He said that he did not know so I then asked him how he was able to suggest a repair cost if he was not able to give a proper diagnosis of the fault. Strangely no answer was forthcoming. The next question was why a functioning system was returned non functioning. His answer was that he had drained all of the refrigerant because not all places are authourised to do so so it could be repaired. At no point was this mentioned or explained in anyway to the customer and no permission was sought nor given for this. The Manager started to look rather sheepish at this point and immediately offered to re-gas the system, which, ironically, seems to have restored full cooling!! Now call me cynical but it is getting towards month end and is it possible they were looking to increase work and bonuses by duping an elderly customer and leaving them with no A.C during the hottest week of the year?