Based on the earlier advice, I gave myself a few days to test it out before sholdering the aircon relay connection in the control unit as suggested by some. Besides occasional non activation of the compressor, today I encountered something very strange. The compressor was working/spinning when I activated the aircon but 5 mins later except for blower working the compressor is dead (not spinning). Now, how is it possible?? After a while when I restart and on the aircon everything was ok (compressor spinning but cool air slightly weaker).

Compressor is new. Recently, refill and check no leak. Then what? Could it be the A/c pressure switch (grey, brown voilet)? Need to change? What is pressostat and where is it located? Or is it due to the connector/switch to the drier? Help please. Cannot afford to change all.