With 95.000 km /7 year old car , the aircon is not as cool as it once was. At isuzu , they don't do aircon.
All around Thailand , you see these signs for "AIR" , from roadside shacks to improvised workplaces, complete with de double pressure gauges and blue can of 134a. Went to see a couple of them , prices from 400 B in my neck of the woods, but no-one speaks english and my thai is not enough for this kind of information.
It looks like every thai with a pressure gauge , thinks he's an aircon man.
Now I see on youtube video's about car aircon , and it is not that simple as changing oil...