Thank you so much for all your replies. It is both very relieving and encouraging knowing there is a less expensive way to fix the problems. The aircon techs here said it is unlikely the magnetic coil of the compressor since the compressor is running when you switch on/off the aircon. Loss compression daw, hindi nag-papump. I asked the aircon techs here in Subic, QS-type daw yung compressor 3-bolts yung mounting, kaya it wouldnt work if I had it replaced with a Sanden or Denso compressor kasi masikip na space plus wala sila specialty tools since flower-type ang screws. I guess yung mga Manila shops na you mentioned ang pag-asa ko to fix the alternator and compressor.
I dont know why sabay bumigay yung alternator and compressor. I guess over-used but poorly-maintained.
Thank you mga bros. I will go to Manila ASAP to get these things done.