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Was it a Merc / Porsche place that diagnosed the work or an AC specialist (do such places exist?)
I've had my Focus 'serviced' (some kind of pressure test which apparently found no fault) and 'refilled' a couple of times, both of which did nothing. I'm not sure where to take it to next to find quite what the problem is and this isn't something that my usual mechanic tackles.
^^My system “just needed some gas”, £1,600 in parts later it works very well.