After sleeping on it and researching Dr Google I realise I'd forgotten a thing or two. Alsymers is catching up.
We will need to access the A/C controllers code - turn on ign, put AC in Auto mode, press both up & down fan switches for 5 sec.
Display will indicate "00" then use "fan auto" switch to scroll thru possible faults - hopefully only one code ' "09" ie no or low refrige gas charge.
If this is the only code, then we need to reset it, simple, disc battery/earth for 10 mins.
Gauges etc connected, as long as enough gas pressure is indicated, start car, switch on AC. (RECIRC, MAX FAN, LOWEST TEMP)
Should now cycle up and start cooling.
BUT ☆ there is always a but - prior to doing any of this - I think it may be prudent to open the system and check the "Orific Tube" and or just replace it.
$10 item with a very small hole (0.052 - 0.0☆☆) which does not take much to block it and its screens.
We have all the gear, gauges, hoses, manifold, Vaccum pump on site, ummm.....