@xulfiqar
Yes i meant nitrogen cycle to purge any moisture in lines...
Yes the AC Guy has dismanteled and taken all parts at his shop to test thoroughly as AC is not cooling at all. There is a possible choke somewhere as needle on the pressure gauge fluctuates alot.
In most 1ton and 1.5 ton units there is only a connector port on the suction line and no port on the liquid line, thats why the guage can only be connected on suction line from where they charge the ac as well. port on the liquid line is in bigger capacity units only.