i just found it myself when im having this aircond problem..instead of sending them to proton service centre,i do it myself..it is not involving major components,just a filter under the dashboard.
this is your aircond filter
1.first locate the filter(the filter is under your dashboard near to the center pedestal)
2.remove the filter
3.blow the filter with compressen air.do not use water as this will damage your filter element
4.install the filter
5.close the cover.make sure they are all tight
6.test your aircond
disclaimer:this is intended for try and error method.no warranty that your aircond problem fixed if its involving another component on your car.if this not working,bring your car to the service centre.
watch the video on how to open the cover and removing the filter
any question please comment