Really appreciate all the replies! Thanks peeps!

What I really want done is to have the car back the way it was before. The car is actually out of warranty already so the best thing to do is take it to Rapide sa may bandang Timog. They've been servicing my car since it went out of warranty and so far I've got no problems with them. But if you guys know a really good AC shop near Marikina or QC area na hindi Casa price ang singil e malaking tulong din.

Unfortunately, nagkamali ako na dalhin sa isang backstreet AC shop because it was nearer and we need the car fixed asap for a trip. Lesson learned.

So, the things to check are:
1. Pressure Switch
2. ATC
3. ECU <--- As much as possible I don't really want to touch this thing.
4. Evaporator Core
5. Drier
6. Expansion Valve

...Parang lahat na a... :D :D :D