How do you recharge Air Con?

Hi all, would be grateful if anyone could tell me which of the 2 valves on drivers side in engine bay I plug air con recharger gas into?
I've searched this and other forums and cannot find anything.
Thanks in advance
John Arundell-FRP426

BOTH.
one is low pressure one is high pressure, air con machine will have both.
Both valves are also different sizes so you cant get them the wrong way round. If you dont know this though you shouldnt really be charging a car with refrigerant as it is potentially dangerous. most garage will do a recharge for around £99 and you need to vacume the system in the process so if there are any leaks this should let you know so you dont just waste your money on gas that then escapes.

basic run down of how its done depending on machine
remove plastic dust capos from HP and LP valves,
press auto run on machine
connect pipes to valves,
open hp and lp ports on machine screw in valve pipe attachements to open the valves,
machine will then recover present gas in system
then vacume
then recharge with amount of refreigerant and oil that you specify. amount is usually written on a yellow sticker on the slam pannel of most cars.
machine will tell you when its done
close hp and lp ports on machine
unscrew the valve pipe attachements
remove pipe dust caps back on
****this is a ROUGH step down of process do not quote me on it as you should be trained to use air con equipment *****