Car appreciation... the aesthetics, the engineering, etc

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.

£1,600 in parts later it works very well.

Years ago a mechanic in training friend re-gassed the ailing A/C in my 70s Yanktankmobile. It was awesomely cold. But he did not add any lubricant to the system and 3 days later the compressor locked up and died. In the summer. In Texas. With vinyl seats. Amazing I didn't die.

I had 4/35* aircon the rest of the summer.

(4 windows rolled down, 35 MPH)